Statement Of Comprehensive Income [Abstract]

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Concept	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31
Statement of comprehensive income [abstract]
Profit (loss)	– GBP	– GBP	– GBP	– GBP	– GBP	3. 5 GBP	3. 5 GBP	– GBP	26 . 8 GBP	– GBP	26 . 8 GBP	– GBP	– GBP	– GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract]
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	– GBP	– GBP	– GBP	– GBP	– GBP	8 . 9 GBP	8 .9 GBP	– GBP	1 . 4 GBP	– GBP	1 . 4 GBP	– GBP	– GBP	– GBP
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Exchange differences on translation [abstract]
Gains (losses) on exchange differences on translation of foreign operations, net of tax	– GBP	– GBP	0. 3 GBP	– GBP	– GBP	0. 3 GBP	- GBP	5 . 3 GBP	– GBP	– GBP	5 . 3 GBP	– GBP	– GBP	– GBP
Cash flow hedges [abstract]
Gains (losses) on cash flow hedges, net of tax	– GBP	– GBP	– GBP	100,000 GBP	– GBP	100,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP	1 .0 GBP	– GBP	– GBP	– GBP
Hedges of net investment in foreign operations [abstract]
Gains (losses) on hedges of net investments in foreign operations, net of tax	—	—	—	—	—	300,000 GBP	—	—	—	—	5 . 3 GBP	—	—	—
Other comprehensive income	– GBP	– GBP	300,000 GBP	100,000 GBP	– GBP	8 . 5 GBP	8 .9 GBP	5 . 3 GBP	1 . 4 GBP	1,000,000 GBP	5 .7 GBP	– GBP	– GBP	– GBP
Comprehensive income	—	—	—	—	—	5 . 0 GBP	—	—	—	—	21 .1 GBP	—	—	—