Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Increase (decrease) through exercise of options, equity |
—
GBP
|
2 . 6
GBP
|
—
GBP
|
—
GBP
|
2 .6
GBP
|
—
GBP
|
—
GBP
|
1. 8
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,800,000
GBP
|
| Purchase of treasury shares |
—
GBP
|
—
GBP
|
8 .7
GBP
|
—
GBP
|
8 .7
GBP
|
—
GBP
|
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