v3.25.4
Financial Liabilities - Borrowings - Summary of Current and Non - Current Borrowings (Detail) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Non-current borrowings £ 1,419 £ 1,157
Finance lease liabilities 416 452
Current borrowings 62 315
Finance lease liabilities 62 65
Overdrafts 0 0
Borrowings 1,481 1,472
1.375% Euro notes 2025 [member]    
Disclosure of detailed information about borrowings [line items]    
Current borrowings 0 250
3.75% GBP notes 2030 [member]    
Disclosure of detailed information about borrowings [line items]    
Non-current borrowings 356 355
5.375% GBP notes 2034 [member]    
Disclosure of detailed information about borrowings [line items]    
Non-current borrowings 350 350
Bank loans and overdrafts [member]    
Disclosure of detailed information about borrowings [line items]    
Overdrafts 0 0
Revolving credits facility [Member]    
Disclosure of detailed information about borrowings [line items]    
Revolving Credit Facilities £ 297 £ 0