Statement Of Cash Flows [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
408,000,000
GBP
|
–
GBP
|
–
GBP
|
408,000,000
GBP
|
2,000,000
GBP
|
406,000,000
GBP
|
— |
209,000,000
GBP
|
— |
210,000,000
GBP
|
1,000,000
GBP
|
210,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
| Cash flows from (used in) operations | — | — | — | — | — | — | — | — |
386,000,000
GBP
|
— |
488,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — | — | — | — |
48,000,000
GBP
|
— |
51,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Interest received, classified as operating activities | — | — | — | — | — | — | — | — |
25,000,000
GBP
|
— |
20,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— |
32,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — | — |
333,000,000
GBP
|
— |
385,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— |
31,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — | — | — |
35,000,000
GBP
|
— |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Dividends received, classified as investing activities | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — | — |
246,000,000
GBP
|
— |
97,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — | — | — | — | — | — | — | — |
47,000,000
GBP
|
— |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Proceeds from issuing shares | — | — | — | — | — | — | — | — |
–
GBP
|
— |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — | — | — | — |
431,000,000
GBP
|
— |
351,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — | — | — |
437,000,000
GBP
|
— |
40 1
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — | — |
20,000,000
GBP
|
— |
22,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — | — |
489,000,000
GBP
|
— |
287,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — | — | — |
90,000,000
GBP
|
— |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — |
427,000,000
GBP
|
— |
340,000,000
GBP
|
— | — | — | — | — | — | — | — |
348,000,000
GBP
|