Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
54,008,000
GBP
|
— |
—
GBP
|
54,008,000
GBP
|
—
GBP
|
— |
—
GBP
|
47,615,000
GBP
|
—
GBP
|
—
GBP
|
47,615,000
GBP
|
—
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||
| Adjustments for finance costs | — | — |
1,287,000
GBP
|
— | — | — | — | — | — |
304,000
GBP
|
— | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — |
2,889,000
GBP
|
— | — | — | — | — | — |
2,569,000
GBP
|
— | — | — | — | — |
| Adjustments for provisions | — | — |
536,000
GBP
|
— | — | — | — | — | — |
522,000
GBP
|
— | — | — | — | — |
| Adjustments for unrealised foreign exchange losses (gains) | — | — |
232,000
GBP
|
— | — | — | — | — | — |
690,000
GBP
|
— | — | — | — | — |
| Adjustments for share-based payments | — | — |
67,000
GBP
|
— | — | — | — | — | — |
997,000
GBP
|
— | — | — | — | — |
| Adjustments for fair value losses (gains) | — | — |
143,000
GBP
|
— | — | — | — | — | — |
1,020,000
GBP
|
— | — | — | — | — |
| 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
|