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Leases - statement of profit or loss (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Leases      
Depreciation charge of rightofuse assets ¥ 75,519,000 ¥ 88,974,000 ¥ 97,924,000
Interest expenses (included in finance cost) 7,578,000 5,803,000 7,736,000
Total expenses recognised in statement of profit or loss 83,097,000 94,777,000 105,660,000
Cash outflow for leases 79,618,000 97,551,000 101,807,000
Expense recognized in relation to short term leases ¥ 2,884,000 ¥ 1,412,000 ¥ 810,000