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Trade and other receivables - Summary of Trade and Other Receivables, Amounts Falling Due Within One Year (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Trade and other receivables [abstract]    
Trade receivables (net of loss allowance) £ 6,487 £ 7,055
Unbilled costs 238 273
VAT and sales taxes recoverable 323 371
Prepayments 221 239
Fair value of derivatives 1 1
Other receivables 452 521
Trade and other receivables £ 7,722 £ 8,460