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Pension arrangements - Defined contribution schemes (Details) - GBP (£)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Pension arrangements      
Contributions to defined contribution pension arrangements £ 2,686,000 £ 2,435,000 £ 2,427,000
Amount of contributions due that had not been paid to pension schemes £ 295,000 £ 284,000