Disclosure Of Fair Value Measurement [Text Block]
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2024-01-01 to 2024-12-31 |
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As at 2023-12-31 |
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As at 2022-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — |
Measurement of fair values
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||||||||||||||
| Assets | — | — | — | — | — | — | — | — | — | — | — |
1,077,100,000
GBP
|
1,038,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||||||||||||||
| Liabilities | — | — | — | — | — | — | — | — | — | — | — |
687,800,000
GBP
|
639,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||||||||||||
| Equity |
36,100,000
GBP
|
179,300,000
GBP
|
111,700,000
GBP
|
70,900,000
GBP
|
35,600,000
GBP
|
38,200,000
GBP
|
353,700,000
GBP
|
— |
4,900,000
GBP
|
200,000
GBP
|
1,000,000
GBP
|
389,300,000
GBP
|
398,600,000
GBP
|
170,800,000
GBP
|
35,700,000
GBP
|
600,000
GBP
|
38,300,000
GBP
|
111,700,000
GBP
|
71,300,000
GBP
|
29,900,000
GBP
|
360,300,000
GBP
|
1,100,000
GBP
|
1,000,000
GBP
|
429,600,000
GBP
|
600,000
GBP
|
40,600,000
GBP
|
111,700,000
GBP
|
35,700,000
GBP
|
170,900,000
GBP
|
71,300,000
GBP
|
–
GBP
|
389,000,000
GBP
|
1,000,000
GBP
|
200,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |