Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations |
40,810,000
GBP
|
— | — |
48,923,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
6,911,000
GBP
|
— | — |
1,909,000
GBP
|
— |
| Cash flows from (used in) operating activities |
33,899,000
GBP
|
— | — |
50,832,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Proceeds from sales of property, plant and equipment, classified as investing activities |
225,000
GBP
|
— | — |
—
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
7,922,000
GBP
|
— | — |
12,347,000
GBP
|
— |
| Cash flows from (used in) investing activities |
12,287,000
GBP
|
— | — |
28,929,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments of lease liabilities, classified as financing activities |
658,000
GBP
|
— | — |
744,000
GBP
|
— |
| Interest paid, classified as financing activities |
393,000
GBP
|
— | — |
212,000
GBP
|
— |
| Cash flows from (used in) financing activities |
242,000
GBP
|
— | — |
83,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
21,854,000
GBP
|
— | — |
79,844,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents |
223,000
GBP
|
— | — |
173,000
GBP
|
— |
| Cash and cash equivalents | — |
49,707,000
GBP
|
71,784,000
GBP
|
— |
151,455,000
GBP
|