Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
21,700,000
GBP
|
21,600,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
32,700,000
GBP
|
34,100,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
200,000
GBP
|
100,000
GBP
|
— |
| Non-current derivative financial assets |
53,700,000
GBP
|
5. 9
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Current receivables due from related parties |
–
GBP
|
100,000
GBP
|
— |
| Other current receivables |
123,100,000
GBP
|
71,200,000
GBP
|
— |
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets at fair value through profit or loss [abstract] | |||
| Non-current financial assets at fair value through profit or loss |
3,792,100,000
GBP
|
3,499,400,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
189,400,000
GBP
|
204,300,000
GBP
|
218,000,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
38,500,000
GBP
|
65 .4
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
173,700,000
GBP
|
137 .9
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
160,200,000
GBP
|
142,900,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Current payables to related parties |
16,300,000
GBP
|
100,000
GBP
|
— |
| Other current payables |
77 .5
GBP
|
39,200,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current derivative financial liabilities |
17 .5
GBP
|
0
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
69,800,000
GBP
|
2,800,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
156. 8
GBP
|
156. 8
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
41,200,000
GBP
|
32,200,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Revaluation surplus |
10,600,000
GBP
|
10,300,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
36. 3
GBP
|
36,300,000
GBP
|
— |
| Capital reserve |
3,548,300,000
GBP
|
3,393,100,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
4,251,400,000
GBP
|
3,902,100,000
GBP
|
— |
| Assets (liabilities) |
3,7 31.2
GBP
|
3,573,300,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
351,000,000
GBP
|
341,000,000
GBP
|
— |
| Current liabilities |
323,800,000
GBP
|
185 .0
GBP
|
— |
| Current assets (liabilities) |
27 .2
GBP
|
156 .0
GBP
|
— |
| Assets less current liabilities [abstract] | |||
| Assets less current liabilities |
3,927 .6
GBP
|
3,717 .1
GBP
|
— |