Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Construction in progress |
9,500,000
GBP
|
13,900,000
GBP
|
— |
| Property, plant and equipment |
1,000,000
GBP
|
300,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
2,708,300,000
GBP
|
2,738,000,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
19,700,000
GBP
|
18,300,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
37,300,000
GBP
|
33,100,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
35,400,000
GBP
|
118,000,000
GBP
|
243,500,000
GBP
|
| Borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current portion of non-current borrowings |
1,246,900,000
GBP
|
1,246,400,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
49,900,000
GBP
|
46,800,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
298,500,000
GBP
|
296,100,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
10,900,000
GBP
|
135,300,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Merger reserve |
231,000,000
GBP
|
231,600,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2,812,200,000
GBP
|
2,922,600,000
GBP
|
— |
| Liabilities |
1,339,100,000
GBP
|
1,335,100,000
GBP
|
— |
| Assets (liabilities) |
1,473,100,000
GBP
|
1,587,500,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
73,100,000
GBP
|
151,500,000
GBP
|
— |
| Current liabilities |
82,400,000
GBP
|
77,800,000
GBP
|
— |
| Assets less current liabilities [abstract] |