Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Adjustments to reconcile profit (loss) [abstract] | |||||
| Adjustments for finance costs | — |
1,900,000
GBP
|
— |
2,900,000
GBP
|
— |
| Adjustments for decrease (increase) in inventories | — |
26,600,000
GBP
|
— |
15,300,000
GBP
|
— |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — |
–
GBP
|
— |
–
GBP
|
— |
| Adjustments for share-based payments | — |
1,200,000
GBP
|
— |
100,000
GBP
|
— |
| Cash flows from (used in) operations | — |
17,300,000
GBP
|
— |
70,700,000
GBP
|
— |
| Interest paid, classified as operating activities | — |
500,000
GBP
|
— |
2,700,000
GBP
|
— |
| Interest received, classified as operating activities | — |
500,000
GBP
|
— |
800,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
3,500,000
GBP
|
— |
6,300,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
13,800,000
GBP
|
— |
62,500,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
— |
1,000,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
19,700,000
GBP
|
— |
100,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
6,100,000
GBP
|
— |
15,000,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
800,000
GBP
|
— |
–
GBP
|
— |
| Cash flows from (used in) investing activities | — |
9,300,000
GBP
|
— |
16,100,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from issuing shares | — |
700,000
GBP
|
— |
200,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
–
GBP
|
— |
50,900,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
1,200,000
GBP
|
— |
48,500,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
15,000,000
GBP
|
— |
15,700,000
GBP
|
— |
| Dividends paid, classified as financing activities | — |
6,600,000
GBP
|
— |
6,300,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
22,100,000
GBP
|
— |
19,400,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
1,000,000
GBP
|
— |
27,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
600,000
GBP
|
— |
400,000
GBP
|
— |
| Cash and cash equivalents |
61,200,000
GBP
|
— |
60,800,000
GBP
|
— |
33,400,000
GBP
|