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Post employment benefits - Balance sheet analysis of post employment plans (Parenthetical) (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
DPS      
Disclosure of defined benefit plans [line items]      
Surplus/Deficit in plan £ 589 £ 1,174 £ 840
GIGIPS      
Disclosure of defined benefit plans [line items]      
Surplus/Deficit in plan 260 221 (79)
Other Schemes      
Disclosure of defined benefit plans [line items]      
Surplus/Deficit in plan £ 111 £ 158 £ 178