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Leases - statement of profit or loss (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Leases      
Depreciation charge of rightofuse assets ¥ 32,666,000 ¥ 39,904,000 ¥ 69,468,000
Interest expenses (included in finance cost) 1,930,000 3,005,000 7,224,000
Cash outflow for leases 39,533,000 67,180,000 79,618,000
Expense recognized in relation to short term leases 3,274,000 6,258,000 2,884,000
Discontinued operations      
Leases      
Depreciation charge of rightofuse assets 817,000 5,178,000 6,051,000
Interest expenses (included in finance cost) 81,000 443,000 354,000
Continuing and Discontinued operations      
Leases      
Depreciation charge of rightofuse assets 33,483,000 45,082,000 75,519,000
Interest expenses (included in finance cost) 2,011,000 3,448,000 7,578,000
Total expenses recognised in statement of profit or loss ¥ 35,494,000 ¥ 48,530,000 ¥ 83,097,000