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Accounting information and policies - New accounting standards and interpretations (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Additional service cost £ 87 £ 38 £ 64
Ireland      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Additional service cost (4) (34) £ 13
Amendments to IAS 19 | Ireland      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Additional service cost £ 1 £ 1