Statement Of Comprehensive Income [Abstract]

British Land Co PLC - Filing #3461622

Concept	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	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	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31
Statement of comprehensive income [abstract]
Profit (loss)	– GBP	265,000,000 GBP	266,000,000 GBP	1,000,000 GBP	– GBP	1,000,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP	2,000,000 GBP	– GBP	1,038,000,000 GBP	– GBP	1,303,000,000 GBP	264,000,000 GBP	1,000,000 GBP	1,038,000,000 GBP	– GBP	– GBP	– GBP	1,039,000,000 GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract]
Exchange differences on translation [abstract]
Reclassification adjustments on exchange differences on translation of foreign operations, before tax	– GBP	—	—	1,000,000 GBP	2,000,000 GBP	1,000,000 GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	– GBP	—	—	2,000,000 GBP	2,000,000 GBP	2,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	10,000,000 GBP	10,000,000 GBP	– GBP	—	—	– GBP	– GBP	– GBP	– GBP	– GBP	10,000,000 GBP
Comprehensive income	– GBP	—	—	3,000,000 GBP	2,000,000 GBP	1,000,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP	2,000,000 GBP	10,000,000 GBP	1,028,000,000 GBP	– GBP	—	—	1,000,000 GBP	1,038,000,000 GBP	– GBP	– GBP	– GBP	1,029,000,000 GBP