v3.26.1
Contract liabilities - Summary of contract liabilities (Details) - GBP (£)
£ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Contract liabilities [abstract]      
Current £ 110 £ 96  
Non-current 2,699 2,418  
Total contract liabilities £ 2,809 £ 2,514 £ 2,246