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Accounting policies - Leases (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Leases            
Incremental borrowing rate (as a percent)           2.22%
Right-of-use assets £ 5,168   £ 5,168      
Lease liability recognized as at 1 July 2019 5,248   5,248      
Operating profit 36,487 £ 43,994 47,454 £ 57,868    
Profit before tax £ 51,745 £ 37,648 £ 54,274 £ 46,396    
Increase (decrease) due to adoption of IFRS 16            
Leases            
Right-of-use assets           £ 6,000
Operating lease commitments disclosed as at 30 June 2019           8,087
Discounted using the Group's incremental borrowing rate as at 1 July 2019           6,246
Less short term leases not recognized as a liability           (270)
Lease liability recognized as at 1 July 2019           £ 5,976
Increase (decrease) due to adoption of IFRS 16 | Forecast            
Leases            
Operating profit         £ 100  
Profit before tax         £ (100)