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 |
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] | ||||||||||||
| Dividends recognised as distributions to non-controlling interests |
200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
–
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through acquisition of subsidiary, equity |
1,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,200,000
GBP
|
2,200,000
GBP
|
–
GBP
|
–
GBP
|
| Increase (decrease) through transactions with owners, equity |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
122,200,000
GBP
|
122,200,000
GBP
|
119,400,000
GBP
|
1,100,000
GBP
|
496,100,000
GBP
|
–
GBP
|
614,400,000
GBP
|
–
GBP
|