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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — | — | — |
1,000,000
GBP
|
— |
300,000
GBP
|
— | — | — | — | — | — | — | — |
| Investment property | — | — | — | — |
2,708,300,000
GBP
|
— |
2,738,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — | — |
19,700,000
GBP
|
— |
18,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — |
600,000
GBP
|
— |
600,000
GBP
|
— | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — |
2,739,100,000
GBP
|
— |
2,771,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables | — | — | — | — |
37,300,000
GBP
|
— |
33,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — |
35,400,000
GBP
|
— |
118,000,000
GBP
|
— | — | — | — | — | — | — |
243,500,000
GBP
|
| Current assets | — | — | — | — |
73,100,000
GBP
|
— |
151,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — | — | — | — |
2,812,200,000
GBP
|
— |
2,922,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | — | — |
298,500,000
GBP
|
— |
296,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — |
10,900,000
GBP
|
— |
135,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium | — | — | — | — |
932,700,000
GBP
|
— |
924,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
231,000,000
GBP
|
10,900,000
GBP
|
932,700,000
GBP
|
298,500,000
GBP
|
1,473,100,000
GBP
|
231,600,000
GBP
|
1,587,500,000
GBP
|
924,500,000
GBP
|
296,100,000
GBP
|
135,300,000
GBP
|
294,800,000
GBP
|
231,200,000
GBP
|
918,500,000
GBP
|
345,100,000
GBP
|
1,789,600,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current liabilities | — | — | — | — |
1,256,700,000
GBP
|
— |
1,257,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables | — | — | — | — |
49,900,000
GBP
|
— |
46,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — |
82,400,000
GBP
|
— |
77,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — |
1,339,100,000
GBP
|
— |
1,335,100,000
GBP
|
— | — | — | — | — | — | — | — |