Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|
| Statement of cash flows [abstract] | |||
| Cash flows from (used in) operating activities [abstract] | |||
| Adjustments for decrease (increase) in trade and other receivables |
29,000,000
GBP
|
5,000,000
GBP
|
59,000,000
GBP
|
| Adjustments for increase (decrease) in trade and other payables |
60,000,000
GBP
|
6,000,000
GBP
|
32,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | |||
| Dividends received from associates, classified as investing activities |
4,000,000
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
| Proceeds from sales of interests in associates |
19,000,000
GBP
|
–
GBP
|
–
GBP
|
| Cash flows from (used in) financing activities [abstract] | |||
| Payments for share issue costs |
–
GBP
|
16,000,000
GBP
|
–
GBP
|