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Pension arrangements - Defined contribution schemes (Details) - GBP (£)
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Pension arrangements      
Contributions to defined contribution pension arrangements £ 4,480,000 £ 3,731,000 £ 3,362,000
Amount of contributions due that had not been paid to pension schemes £ 659,000 £ 532,000