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Commitments Under Operating Leases (Details) - GBP (£)
£ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Disclosure of maturity analysis of operating lease payments [line items]    
Minimum lease payments payable under non-cancellable operating lease £ 48,664 £ 37,288
Amounts payable within 1 year    
Disclosure of maturity analysis of operating lease payments [line items]    
Minimum lease payments payable under non-cancellable operating lease 10,384 7,638
Amounts payable 1 to 3 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Minimum lease payments payable under non-cancellable operating lease 19,011 13,374
Amounts payable 3 to 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Minimum lease payments payable under non-cancellable operating lease 12,800 9,700
Amounts payable in more than 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Minimum lease payments payable under non-cancellable operating lease £ 6,469 £ 6,576