Statement Of Comprehensive Income [Abstract]

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Concept	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30	2020-10-01 to 2021-09-30
Statement of comprehensive income [abstract]
Profit (loss)	6,127,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	6,127,000 GBP	– GBP	– GBP	27,364,000 GBP	– GBP	27,364,000 GBP	– GBP	– GBP	– GBP
Other comprehensive income [abstract]
Other comprehensive income	73,027,000 GBP	69,953,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	3,074,000 GBP	– GBP	– GBP	2,773,000 GBP	– GBP	– GBP	2,773,000 GBP	– GBP	– GBP
Comprehensive income	66,900,000 GBP	69,953,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	3,053,000 GBP	– GBP	– GBP	30,137,000 GBP	– GBP	27,364,000 GBP	2,773,000 GBP	– GBP	– GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	66,900,000 GBP	—	—	—	—	—	—	—	—	—	30,137,000 GBP	—	—	—	—	—