Statement Of Comprehensive Income [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 comprehensive income [abstract] | ||||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
3 .9
GBP
|
6 5 .1
GBP
|
61 . 2
GBP
|
61. 2
GBP
|
10 8 . 3
GBP
|
—
GBP
|
18 .7
GBP
|
—
GBP
|
8 9.6
GBP
|
10 8 . 3
GBP
|
—
GBP
|
—
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations |
—
GBP
|
—
GBP
|
—
GBP
|
1. 4
GBP
|
—
GBP
|
1,400,000
GBP
|
1. 4
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,700,000
GBP
|
1. 7
GBP
|
1,700,000
GBP
|
—
GBP
|
—
GBP
|
| Comprehensive income |
—
GBP
|
—
GBP
|
—
GBP
|
1,400,000
GBP
|
3 .9
GBP
|
66,500,000
GBP
|
62 .6
GBP
|
61,200,000
GBP
|
10 8 .3
GBP
|
—
GBP
|
18 .7
GBP
|
1,700,000
GBP
|
8 7. 9
GBP
|
10 6 . 6
GBP
|
—
GBP
|
—
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — |
3 .9
GBP
|
66,500,000
GBP
|
62 .6
GBP
|
— | — | — |
18 .7
GBP
|
— |
8 7. 9
GBP
|
10 6 . 6
GBP
|
— | — |