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Financial risk management - Movements on the hedging reserve (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Movements on the hedging reserve      
Hedging reserve, beginning balance £ (1,000) £ 4,002 £ 950
Movement recognized in other comprehensive income, hedging reserve      
Exchange differences on hedged foreign exchange risks 582 (4,482) 2,088
Reclassified to profit or loss 1,049 1,986 267
Change in fair value   (4,173) 1,715
Tax relating to above (408) 1,667 (1,018)
Movement recognized in other comprehensive income 1,223 (5,002) 3,052
Hedging reserve, ending balance 223 (1,000) 4,002
Movements on hedging reserve before tax      
Hedging reserve, before tax, beginning balance 6,216 12,885 8,815
Movement recognized in other comprehensive income, hedging reserve, before tax      
Exchange differences on hedged foreign exchange risks 582 (4,482) 2,088
Reclassified to profit or loss 1,049 1,986 267
Change in fair value   (4,173) 1,715
Movement recognized in other comprehensive income 1,631 (6,669) 4,070
Reclassified (7,525)    
Hedging reserve, before tax, ending balance 322 6,216 12,885
Movements on hedging reserve tax      
Hedging reserve, tax, beginning balance (7,216) (8,883) (7,865)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Tax (expense)/credit relating to movements on hedges (408) 1,667 (1,018)
Reclassified 7,525    
Hedging reserve, tax, ending balance (99) (7,216) (8,883)
Currency risk      
Movement recognized in other comprehensive income, hedging reserve      
Exchange differences on hedged foreign exchange risks 1,069 (880) 1,004
Reclassified to profit or loss 347 332 287
Movements on hedging reserve before tax      
Hedging reserve, before tax, beginning balance (420) 128 (1,163)
Movement recognized in other comprehensive income, hedging reserve, before tax      
Exchange differences on hedged foreign exchange risks 1,069 (880) 1,004
Reclassified to profit or loss 347 332 287
Movement recognized in other comprehensive income 1,416 (548) 1,291
Hedging reserve, before tax, ending balance 996 (420) 128
Interest rate risk      
Movement recognized in other comprehensive income, hedging reserve      
Change in fair value   (4,173) 1,715
Movements on hedging reserve before tax      
Hedging reserve, before tax, beginning balance   4,173 2,458
Movement recognized in other comprehensive income, hedging reserve, before tax      
Change in fair value   (4,173) 1,715
Movement recognized in other comprehensive income   (4,173) 1,715
Hedging reserve, before tax, ending balance     4,173
Other price risk      
Movement recognized in other comprehensive income, hedging reserve      
Exchange differences on hedged foreign exchange risks (487) (3,602) 1,084
Reclassified to profit or loss 702 1,654 (20)
Movements on hedging reserve before tax      
Hedging reserve, before tax, beginning balance 6,636 8,584 7,520
Movement recognized in other comprehensive income, hedging reserve, before tax      
Exchange differences on hedged foreign exchange risks (487) (3,602) 1,084
Reclassified to profit or loss 702 1,654 (20)
Movement recognized in other comprehensive income 215 (1,948) 1,064
Reclassified (7,525)    
Hedging reserve, before tax, ending balance £ (674) £ 6,636 £ 8,584