v3.25.4
Operating Expenses - Summary of Operating Expenses by Function (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Expenses 1 [abstract]      
Cost of goods sold £ 1,717 £ 1,741 £ 1,839
Distribution costs 38 43 47
Selling, marketing and product development costs 525 510 549
Administrative and other expenses 733 754 767
Reorganisation costs 0 (2) 0
Product development impairment 87 0 0
Other income (32) (40) (41)
Total net operating expenses 1,351 1,265 1,322
Other net gains and losses 3 7 16
Total £ 3,071 £ 3,013 £ 3,177