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Related party transactions (Tables)
6 Months Ended
Jun. 30, 2021
Disclosure of transactions between related parties [abstract]  
Summary of related party transactions outstanding
The following amounts were outstanding at 30 June 2021:
 
     
30 June
2021
   
31 December
2020
 
     
£m
   
£m
 
Amounts owed by related parties
                
Kantar
     135.5       39.0  
Other
     46.3       27.9  
 
     181.8       66.9  
Amounts owed to related parties
                
Kantar
     (6.3     (5.6
Other
     (62.3     (36.0
 
     (68.6     (41.6