v3.26.3
Additional information - Financial Statement Schedule I - Condensed statement of cash flows (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities      
Profit/(loss) before income tax £ (46,985,000) £ (39,664,000) £ (130,724,000)
Adjustments for:      
Non-cash employee benefit expense - equity-settled share-based payments 243,000 658,000 875,000
Foreign exchange (gains)/losses on operating activities 3,638,000 3,594,000 2,041,000
Changes in working capital:      
Other receivables 12,577,000 (10,959,000) 7,193,000
Net cash inflow from operating activities 178,715,000 72,702,000 85,671,000
Cash flows from financing activities      
Proceeds from issue of shares   79,985,000 158,542,000
Net cash inflow from financing activities 35,308,000 209,582,000 86,231,000
Cash flows from investing activities      
Net cash outflow from investing activities (229,574,000) (274,675,000) (171,204,000)
Effect of exchange rate changes on cash and cash equivalents (3,308,000) 4,947,000 (3,168,000)
Net (decrease)/increase in cash and cash equivalents (18,859,000) 12,556,000 (2,470,000)
Cash and cash equivalents at beginning of year 86,105,000 73,549,000 76,019,000
Cash and cash equivalents at end of year 67,246,000 86,105,000 73,549,000
Parent      
Cash flows from operating activities      
Profit/(loss) before income tax 850,000 (898,000) (51,681,000)
Adjustments for:      
Non-cash employee benefit expense - equity-settled share-based payments 243,000 658,000 875,000
Foreign exchange (gains)/losses on operating activities (4,000) 18,000 1,000
Changes in working capital:      
Other receivables     (1,000)
Amounts owed by subsidiaries (6,828,000) (6,111,000) (3,371,000)
Other payables 365,000 (6,433,000) 3,216,000
Amounts due to subsidiaries 5,379,000 12,486,000 25,253,000
Net cash inflow from operating activities 5,000 (280,000) (25,708,000)
Cash flows from financing activities      
Proceeds from issue of shares   79,985,000 158,541,000
Net cash inflow from financing activities   79,985,000 158,541,000
Cash flows from investing activities      
Loans advanced to subsidiaries   (79,985,000) (133,175,000)
Net cash outflow from investing activities   (79,985,000) (133,175,000)
Effect of exchange rate changes on cash and cash equivalents 4,000 (18,000) (1,000)
Net (decrease)/increase in cash and cash equivalents 9,000 (298,000) (343,000)
Cash and cash equivalents at beginning of year 74,000 372,000 715,000
Cash and cash equivalents at end of year £ 83,000 £ 74,000 £ 372,000