Statement Of Comprehensive Income [Abstract]
| 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 |
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
|
26,000,000
GBP
|
–
GBP
|
2 6.0
GBP
|
–
GBP
|
–
GBP
|
50,700,000
GBP
|
50. 7
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans |
–
GBP
|
–
GBP
|
–
GBP
|
1 .1
GBP
|
–
GBP
|
1 .1
GBP
|
–
GBP
|
–
GBP
|
19,400,000
GBP
|
1 9.4
GBP
|
–
GBP
|
–
GBP
|
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss |
–
GBP
|
–
GBP
|
–
GBP
|
0. 2
GBP
|
–
GBP
|
0. 2
GBP
|
–
GBP
|
–
GBP
|
4. 8
GBP
|
4. 8
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income | — | — | — |
2 .9
GBP
|
— | — | — | — | — |
2 0.1
GBP
|
— | — |
| Comprehensive income attributable to [abstract] | ||||||||||||
| Comprehensive income, attributable to owners of parent |
–
GBP
|
2 . 0
GBP
|
–
GBP
|
23. 1
GBP
|
–
GBP
|
25,100,000
GBP
|
–
GBP
|
5. 5
GBP
|
36 .1
GBP
|
30. 6
GBP
|
–
GBP
|
–
GBP
|