Contract liabilities - Schedule of significant changes in contract assets and contract liabilities (Details) - GBP (£) £ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Increase (Decrease) in Contract Liabilities [Roll Forward] | ||
| As at 1 April | £ 2,006 | £ 1,472 |
| Exchange adjustments | (27) | 54 |
| Revenue recognised that was included in the contract liability balance at the beginning of the period | (252) | (292) |
| Increases due to cash received, excluding amounts recognised as revenue during the period | 519 | 772 |
| At 31 March | £ 2,246 | £ 2,006 |