Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) financing activities [abstract] | ||
| Dividends paid to non-controlling interests, classified as financing activities |
21,000,000
GBP
|
21,000,000
GBP
|
| Proceeds from issue of bonds, notes and debentures |
—
GBP
|
496,000,000
GBP
|
| Proceeds from contributions of non-controlling interests |
6,000,000
GBP
|
—
GBP
|