Borrowings - Schedule of lease obligations (Details) - GBP (£) £ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | £ 1,119 | £ 1,062 |
| Less: finance charges allocated to future periods | (226) | (233) |
| Lease liabilities | 893 | 829 |
| Less than 1 year | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 172 | 143 |
| Lease liabilities | 145 | 120 |
| 1 to 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 491 | 425 |
| Lease liabilities | 407 | 347 |
| More than 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 456 | 494 |
| Lease liabilities | £ 341 | £ 362 |