Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Increase (decrease) through exercise of options, equity |
—
GBP
|
—
GBP
|
3 . 8
GBP
|
3,800,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
2 .6
GBP
|
—
GBP
|
—
GBP
|
2,600,000
GBP
|
—
GBP
|
| Purchase of treasury shares |
—
GBP
|
1. 8
GBP
|
—
GBP
|
1. 8
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
8. 7
GBP
|
—
GBP
|
8,700,000
GBP
|
—
GBP
|