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Related party transactions - Summary of related party transaction outstanding (Detail) - Associates - GBP (£)
£ in Millions
Jun. 30, 2022
Dec. 31, 2021
Amounts owed by related parties    
Amounts owed by related parties £ 70.7 £ 76.0
Amounts owed to related parties    
Amounts owed to related parties (72.8) (57.6)
Kantar    
Amounts owed by related parties    
Amounts owed by related parties 27.9 30.3
Amounts owed to related parties    
Amounts owed to related parties (6.3) (6.2)
Other    
Amounts owed by related parties    
Amounts owed by related parties 42.8 45.7
Amounts owed to related parties    
Amounts owed to related parties £ (66.5) £ (51.4)