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 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
1 67
GBP
|
–
GBP
|
1 67
GBP
|
–
GBP
|
3,000,000
GBP
|
170,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
76,000,000
GBP
|
–
GBP
|
— |
74,000,000
GBP
|
2,000,000
GBP
|
74,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Cash flows from (used in) operations | — | — | — | — | — | — |
4 67
GBP
|
— | — | — | — |
438,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — | — |
4 6
GBP
|
— | — | — | — |
4 6
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — |
52,000,000
GBP
|
— | — | — | — |
89,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — |
353,000,000
GBP
|
— | — | — | — |
286,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — |
55,000,000
GBP
|
— | — | — | — |
4 3
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Proceeds from sales of other long-term assets, classified as investing activities | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Interest received, classified as investing activities | — | — | — | — | — | — |
39,000,000
GBP
|
— | — | — | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as investing activities | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — |
30,000,000
GBP
|
— | — | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — |
39,000,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — |
277,000,000
GBP
|
— | — | — | — |
130,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — |
46,000,000
GBP
|
— | — | — | — |
17 1
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
40,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | — |
1,0 68
GBP
|
— | — |
1,0 2 9
GBP
|
— | — | — | — | — | — | — | — |