Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||
| Increase (decrease) through acquisition of subsidiary, equity |
39. 6
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
39. 6
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through transactions with owners, equity |
24 . 6
GBP
|
2,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
0. 2
GBP
|
4 4 .1
GBP
|
7 1 .1
GBP
|
6 4 . 7
GBP
|
0 .1
GBP
|
6 4 . 2
GBP
|
–
GBP
|
–
GBP
|
0 .4
GBP
|
–
GBP
|
–
GBP
|