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Income tax (expense)/credit - Additional information related to tax (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Income tax related to recognition in other comprehensive income          
Deferred tax (Note 18) £ (517) £ (350) £ (419) £ (291) £ (1,287)
Total income tax expense recognized in other comprehensive income £ (517) £ (350) £ (419) £ (291)