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Trade and other receivables - Schedule of trade and other receivables (Details) - GBP (£)
£ in Millions
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure Of Trade And Other Receivables [Line Items]      
Accrued income £ 885 £ 1,126  
Trade receivables 4,332 3,052  
Trade receivables and accrued income, net 2,827 3,149  
Prepayments 385 389  
Contract assets 76 49  
Other receivables 127 243  
Trade and other receivables [1] 3,415 3,830  
Non-current prepayments 390 124  
Gross carrying amount      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables 2,501 2,583  
Accrued income 885 1,126  
Gross carrying amount | Trade receivables      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables 2,501 2,583  
Accumulated impairment      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables (559) (560)  
Accumulated impairment | Trade receivables      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables £ (559) (560) £ (741)
Increase (decrease) due to voluntary changes in accounting policy      
Disclosure Of Trade And Other Receivables [Line Items]      
Prepayments   (53)  
Non-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).