Statement Of Cash Flows [Abstract]
| Concept |
As at 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 |
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 |
As at 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 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||
| Profit (loss) | — |
—
GBP
|
—
GBP
|
163,928,000
GBP
|
—
GBP
|
163,928,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— |
—
GBP
|
86,484,000
GBP
|
86,484,000
GBP
|
—
GBP
|
107 ,655
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||
| Adjustments for finance costs | — | — | — |
2,104,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
448,000
GBP
|
— |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
10,700,000
GBP
|
— |
| Adjustments for provisions | — | — | — |
6,160,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12,625,000
GBP
|
— |
| Adjustments for unrealised foreign exchange losses (gains) | — | — | — |
3,14 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,000
GBP
|
— |
| Adjustments for share-based payments | — | — | — |
33,818,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
39, 016
GBP
|
— |
| Other adjustments for non-cash items | — | — | — |
83,067,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Cash flows from (used in) operations | — | — | — |
89,061,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
59,582,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — | — | — |
12,150,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
10,678,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — |
76,911,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
48,904,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
1,158,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
925,000
GBP
|
— |
| Proceeds from sales of other long-term assets, classified as investing activities | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3,000
GBP
|
— |
| Interest received, classified as investing activities | — | — | — |
1,544,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
56,000
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — |
41,354,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
866,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||
| Proceeds from issuing other equity instruments | — | — | — |
136 ,680
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
7 ,038
GBP
|
— |
| Interest paid, classified as financing activities | — | — | — |
122,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — |
162,978,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
5,035,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — |
44 ,713
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
44,735,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — |
3,176,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
83,000
GBP
|
— |
| Cash and cash equivalents |
88,442,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
40,553,000
GBP
|
— | — | — | — | — |
85,371,000
GBP
|