Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2024-01-01 |
As at 2023-12-31 |
As at 2023-01-01 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Property, plant and equipment |
34,284,000
GBP
|
— |
34,183,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets and goodwill |
28,625,000
GBP
|
— |
25,866,000
GBP
|
— |
| Investment property [abstract] | ||||
| Investment property |
128,5 63
GBP
|
— |
130,813,000
GBP
|
— |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
105,761,000
GBP
|
112,08 2
GBP
|
112,082,000
GBP
|
104,664,000
GBP
|
| Miscellaneous assets [abstract] | ||||
| Investments other than investments accounted for using equity method |
982,001,000
GBP
|
— |
941,7 55
GBP
|
— |
| Other assets |
156,768,000
GBP
|
— |
165,104,000
GBP
|
— |
| Classes of other provisions [abstract] | ||||
| Other provisions [abstract] | ||||
| Other provisions |
5,979,000
GBP
|
— |
6,330,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | ||||
| Subordinated liabilities [abstract] | ||||
| Subordinated liabilities |
25,112,000
GBP
|
— |
25,853,000
GBP
|
— |
| Investment contracts liabilities |
133,706,000
GBP
|
— |
95,886,000
GBP
|
— |
| Other liabilities |
61,84 3
GBP
|
— |
57,279,000
GBP
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
120,4 77
GBP
|
— |
120 ,477
GBP
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
1,702, 718
GBP
|
— |
1,663,363,000
GBP
|
— |
| Liabilities |
1,075,675,000
GBP
|
— |
1,0 34,447
GBP
|
— |
| Assets less current liabilities [abstract] |