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Related party transactions (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of transactions between related parties [abstract]  
Summary of related party transactions outstanding
The following amounts were outstanding at 31 December 2019:
 
 
  
2019
£m
 
Amounts owed by related parties
  
 
 
 
Kantar
  
 
87.5
 
Other
  
 
87.5
 
 
  
 
175.0
 
Amounts owed to related parties
  
 
 
 
Kantar
  
 
(36.5
Other
  
 
(49.6
 
  
 
(86.1