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Post employment benefits - Balance sheet analysis of post employment plans (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of defined benefit plans [line items]    
Non-current assets £ 960 £ 1,553
Non-current liabilities (373) (402)
Surplus restriction 7 14
Funded plans    
Disclosure of defined benefit plans [line items]    
Non-current assets 960 1,553
Non-current liabilities (132) (144)
Unfunded plans    
Disclosure of defined benefit plans [line items]    
Non-current liabilities £ (241) £ (258)