v3.25.4
Intangible Assets - Summary of Amortisation Profile of Intangible Assets (Detail)
£ in Millions
Dec. 31, 2025
GBP (£)
Acquired customer lists, contracts and relationships [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets £ 160
Acquired trademarks and brands [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 20
Acquired publishing rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 1
Other acquired intangibles [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 82
One to five years [member] | Acquired customer lists, contracts and relationships [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 72
One to five years [member] | Acquired trademarks and brands [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 16
One to five years [member] | Acquired publishing rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 1
One to five years [member] | Other acquired intangibles [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 69
Six to ten years [member] | Acquired customer lists, contracts and relationships [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 50
Six to ten years [member] | Acquired trademarks and brands [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 4
Six to ten years [member] | Acquired publishing rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 0
Six to ten years [member] | Other acquired intangibles [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 9
Eleven to fifteen years [member] | Acquired customer lists, contracts and relationships [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 34
Eleven to fifteen years [member] | Acquired trademarks and brands [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 0
Eleven to fifteen years [member] | Acquired publishing rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 0
Eleven to fifteen years [member] | Other acquired intangibles [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 4
Sixteen to twenty years [member] | Acquired customer lists, contracts and relationships [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 4
Sixteen to twenty years [member] | Acquired trademarks and brands [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 0
Sixteen to twenty years [member] | Acquired publishing rights [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets 0
Sixteen to twenty years [member] | Other acquired intangibles [member]  
Disclosure of detailed information about intangible assets [line items]  
Acquired intangible assets are included within non-current Intangible assets £ 0