v3.25.4
Operating Expenses - Summary of Operating Expenses by Nature (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Expense by nature [line items]      
Royalties expensed £ 162 £ 162 £ 164
Other product costs 354 371 393
Employee benefit expense 1,423 1,411 1,467
Contract labour 29 56 70
Employee-related expense 47 53 60
Promotional costs 126 113 146
Depreciation and impairment of property, plant and equipment and investment property and assets held for sale 54 77 90
Property and facilities 68 70 82
Technology and communications 218 215 215
Professional and outsourced services 424 395 443
Other general and administrative costs 92 72 43
Costs capitalised (414) (398) (424)
Other net gains and losses 3 7 16
Other income (32) (40) (41)
Total 3,071 3,013 3,177
Product development [member]      
Expense by nature [line items]      
Amortisation and impairment of intangible assets 364 291 284
Software [member]      
Expense by nature [line items]      
Amortisation and impairment of intangible assets 112 117 123
Other [member]      
Expense by nature [line items]      
Amortisation and impairment of intangible assets £ 41 £ 41 £ 46