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Acquisition and sale of businesses and brands and purchase of non-controlling interests - Acquisitions in the year (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about business combination [line items]        
Cash consideration paid £ (88)   £ (358) £ (27)
Deferred consideration payable        
Disclosure of detailed information about business combination [line items]        
Deferred/contingent consideration payable 4   2 £ 0
Other businesses acquired        
Disclosure of detailed information about business combination [line items]        
Cash consideration paid (26)   (95)  
Other businesses acquired | Maximum        
Disclosure of detailed information about business combination [line items]        
Maximum value for contingent consideration payments (18)   (86)  
Other businesses acquired | Deferred consideration payable        
Disclosure of detailed information about business combination [line items]        
Deferred/contingent consideration payable £ 4   £ 2  
21Seeds        
Disclosure of detailed information about business combination [line items]        
Percentage of interest acquired   100.00%    
Cash consideration paid   £ (62)    
21Seeds | Maximum        
Disclosure of detailed information about business combination [line items]        
Maximum value for contingent consideration payments   £ (61)