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 |
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 |
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 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
79. 6
GBP
|
75,600,000
GBP
|
4 .0
GBP
|
700,000
GBP
|
80,300,000
GBP
|
7 5.6
GBP
|
54,700,000
GBP
|
300,000
GBP
|
4,300,000
GBP
|
–
GBP
|
5 0 .1
GBP
|
— |
–
GBP
|
54,400,000
GBP
|
5 0 .1
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||
| Adjustments for finance costs | — | — | — |
2,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3 .1
GBP
|
— | — |
| Adjustments for decrease (increase) in inventories | — | — | — |
0 .9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
200,000
GBP
|
— | — |
| Adjustments for decrease (increase) in trade accounts receivable | — | — | — |
26. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
38,700,000
GBP
|
— | — |
| Adjustments for increase (decrease) in trade accounts payable | — | — | — |
16,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 9 .1
GBP
|
— | — |
| Adjustments for provisions | — | — | — |
500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
0 .1
GBP
|
— | — |
| Adjustments for share-based payments | — | — | — |
1,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,800,000
GBP
|
— | — |
| Cash flows from (used in) operations | — | — | — |
199,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
134,300,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — | — | — |
20,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
9,200,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — | — | — |
178,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
125. 1
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — |
4,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,600,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
7 .6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3,700,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,900,000
GBP
|
— | — |
| Dividends received, classified as investing activities | — | — | — |
200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Interest received, classified as investing activities | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
0. 2
GBP
|
— | — |
| Cash flows from (used in) investing activities | — | — | — |
5,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
14,300,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Proceeds from issuing shares | — | — | — |
2,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,800,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — | — | — |
600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
0 . 1
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — | — | — |
11,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
9. 1
GBP
|
— | — |
| Interest paid, classified as financing activities | — | — | — |
2,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,300,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — | — | — |
63,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
51,200,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — |
110,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
88,200,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — |
12,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Cash and cash equivalents |
384,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
261,600,000
GBP
|
— | — | — |
173,400,000
GBP
|