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Other non-current assets (Details) - GBP (£)
£ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Other Non-Current Assets [Line Items]    
Other receivables £ 458 £ 496
Prepayments 390 124
Other non-current assets [1] 848 620
Current prepayments £ (385) (389)
Increase (decrease) due to voluntary changes in accounting policy    
Disclosure Of Other Non-Current Assets [Line Items]    
Prepayments   53
Current prepayments   £ 53
[1] In the year, we have revised our policy in relation to the classification of capital expenditure prepayments between current and non-current in order to align these to the operating cycles
of the underlying assets to which they relate. Accordingly, comparative amounts have been re-presented to reflect this change (see notes 14 and 19).