Statement Of Financial Position [Abstract]
| Concept |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — |
3 .0
GBP
|
4,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — | — | — |
2,408,500,000
GBP
|
2,643,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | — | — | — | — | — |
65,700,000
GBP
|
123,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — |
300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — |
11,600,000
GBP
|
18,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
49,000,000
GBP
|
— |
| Assets | — | — | — | — | — |
2,531,400,000
GBP
|
2,839. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — | — | — | — |
191,900,000
GBP
|
191,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — |
977 .3
GBP
|
1,219,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — |
296,600,000
GBP
|
295,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — | — | — |
9,900,000
GBP
|
9,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — |
93,000,000
GBP
|
91,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
93 .0
GBP
|
977 .3
GBP
|
296,600,000
GBP
|
191,900,000
GBP
|
9,900,000
GBP
|
1,548,900,000
GBP
|
1,787,700,000
GBP
|
295,500,000
GBP
|
191,600,000
GBP
|
9 .9
GBP
|
1,219,500,000
GBP
|
91. 0
GBP
|
9,900,000
GBP
|
181. 1
GBP
|
1,300,300,000
GBP
|
295,500,000
GBP
|
1,7 99.6
GBP
|
32,600,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Liabilities | — | — | — | — | — |
982,500,000
GBP
|
1,051,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |