| Q3 IMS           | 
                                                                                        
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                                                                                        | Interim results announcement           | 
                                                                                        
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                                                                                        | Q1 IMS and AGM           | 
                                                                                        
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                                                                                        | Preliminary results announcement           | 
                                                                                        
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                                                                                        | Trading Update           | 
                                                                                        
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                                                                                        | Q3 Interim management statement           | 
                                                                                        
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                                                                                        | Interim results announcement           | 
                                                                                        
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                                                                                        | Q1 Interim Management Statement and AGM           | 
                                                                                        
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                                                                                        | Preliminary results announcement           | 
                                                                                        
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                                                                                        | Q4 trading update           | 
                                                                                        
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                                                                                        | Q3 Trading update 2023           | 
                                                                                        
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                                                                                        | Interim results HY 2023           | 
                                                                                        
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                                                                                        | Interim Management Statement Q1 2022 and AGM           | 
                                                                                        
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                                                                                        | Preliminary Results FY 2022           | 
                                                                                        
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                                                                                        | Q4 Trading update           | 
                                                                                        
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                                                                                        | Q3 Interim Management Statement 2022           | 
                                                                                        
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                                                                                        | Test financial calendar date (Mike Ashcroft)           | 
                                                                                        
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                                                                                        | Interim results HY 2022           | 
                                                                                        
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                                                                                        | Interim Management Statement Q1 2022 and AGM           | 
                                                                                        
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                                                                                        | Preliminary Results FY 2021           | 
                                                                                        
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                                                                                        | Q4 Trading update           | 
                                                                                        
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                                                                                        | Q4 Trading update           | 
                                                                                        
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                                                                                        | Q3 Interim Management Statement            | 
                                                                                        
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                                                                                        | Interim results HY 2021            | 
                                                                                        
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                                                                                        | Interim Management Statement Q1 2021 and AGM           | 
                                                                                        
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                                                                                        | Preliminary Results FY 2020           | 
                                                                                        
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                                                                                        | Q4 Trading update           | 
                                                                                        
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                                                                                        | Interim Management Statement Q3 2020           | 
                                                                                        
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                                                                                        | Results for the half year to 30 June 2020 announced           | 
                                                                                        
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                                                                                        | Annual General Meeting and Interim Management Statement Q1 2020           | 
                                                                                        
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                                                                                        | Results for 2019 announced           | 
                                                                                        
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                                                                                        | Trading update           | 
                                                                                        
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                                                                                        | Interim Management Statement Q3 2019           | 
                                                                                        
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                                                                                        | Strategic update           | 
                                                                                        
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                                                                                        | Interim 2019 dividend paid           | 
                                                                                        
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                                                                                        | Record date for interim 2019 dividend           | 
                                                                                        
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                                                                                        | Ex dividend date for interim 2019 dividend           | 
                                                                                        
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                                                                                        | Results for the half year to 30 June 2019 announced           | 
                                                                                        
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                                                                                        | Final 2018 dividend paid           | 
                                                                                        
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                                                                                        | Annual General Meeting and Interim Management Statement Q1 2019           | 
                                                                                        
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                                                                                        | Record date for final 2018 dividend           | 
                                                                                        
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                                                                                        | Ex dividend date for final 2018 dividend           | 
                                                                                        
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                                                                                        | Results for 2018 announced           | 
                                                                                        
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                                                                                        | Trading update           | 
                                                                                        
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                                                                                        | Interim Management Statement Q3           | 
                                                                                        
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                                                                                        | Interim 2018 dividend paid           | 
                                                                                        
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                                                                                        | Record date for interim 2018 dividend           | 
                                                                                        
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                                                                                        | Ex dividend date for interim 2018 dividend           | 
                                                                                        
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                                                                                        | Results for half year to 30 June 2018 announced           | 
                                                                                        
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                                                                                        | Final 2017 dividend paid           | 
                                                                                        
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                                                                                        | Annual General Meeting and Interim Management Statement Q1           | 
                                                                                        
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                                                                                        | Record date for final 2017 dividend           | 
                                                                                        
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                                                                                        | Ex dividend date for final 2017 dividend           | 
                                                                                        
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                                                                                        | Results for 2017 announced           | 
                                                                                        
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                                                                                        | Interim Management Statement Q3 2017           | 
                                                                                        
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                                                                                        | Interim 2017 dividend           | 
                                                                                        
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                                                                                        | Results for half year to 30 June 2017 announced           | 
                                                                                        
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                                                                                        | Final 2016 dividend           | 
                                                                                        
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                                                                                        | Annual General Meeting and Interim Management Statement Q1           | 
                                                                                        
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                                                                                        | Results for 2016 announced           | 
                                                                                        
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                                                                                        | Trading update           | 
                                                                                        
           |