Statement Of Cash Flows [Abstract]
| Concept |
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 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-01-01 |
As at 2019-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||
| Profit (loss) | — |
254,125,000
GBP
|
254,125,000
GBP
|
254,125,000
GBP
|
76,813,000
GBP
|
— |
76,813,000
GBP
|
76,813,000
GBP
|
— | — |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||
| Adjustments for decrease (increase) in inventories | — | — |
125,634,000
GBP
|
— | — | — |
168,580,000
GBP
|
— | — | — |
| Adjustments for provisions | — | — |
1,018,000
GBP
|
— | — | — |
15,821,000
GBP
|
— | — | — |
| Adjustments for share-based payments | — | — |
4,543,000
GBP
|
— | — | — |
2,7 41
GBP
|
— | — | — |
| Adjustments for losses (gains) on disposal of non-current assets | — | — |
1,000
GBP
|
— | — | — |
15,000
GBP
|
— | — | — |
| Cash flows from (used in) operations | — | — |
323,861,000
GBP
|
— | — | — |
231,042,000
GBP
|
— | — | — |
| Interest paid, classified as operating activities | — | — |
18,931,000
GBP
|
— | — | — |
26,158,000
GBP
|
— | — | — |
| Interest received, classified as operating activities | — | — |
23,062,000
GBP
|
— | — | — |
18,232,000
GBP
|
— | — | — |
| Income taxes paid (refund), classified as operating activities | — | — |
65,411,000
GBP
|
— | — | — |
21,851,000
GBP
|
— | — | — |
| Other inflows (outflows) of cash, classified as operating activities | — | — |
29,991,000
GBP
|
— | — | — |
14,867,000
GBP
|
— | — | — |
| Cash flows from (used in) operating activities | — | — |
267,026,000
GBP
|
— | — | — |
181,669,000
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
|
— | — | — |
394,578,000
GBP
|
— | — | — |
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | — | — |
265,000
GBP
|
— | — | — |
234,000
GBP
|
— | — | — |
| Other cash payments to acquire interests in joint ventures, classified as investing activities | — | — |
124,94 7
GBP
|
— | — | — |
3,682,000
GBP
|
— | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — |
1,546,000
GBP
|
— | — | — |
2,632,000
GBP
|
— | — | — |
| Purchase of intangible assets, classified as investing activities | — | — |
1,516,000
GBP
|
— | — | — |
109,000
GBP
|
— | — | — |
| Interest paid, classified as investing activities | — | — |
17,835,000
GBP
|
— | — | — |
14,661,000
GBP
|
— | — | — |
| Interest received, classified as investing activities | — | — |
12,000
GBP
|
— | — | — |
90,000
GBP
|
— | — | — |
| Other inflows (outflows) of cash, classified as investing activities | — | — |
16,989,000
GBP
|
— | — | — |
27,043,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities | — | — |
45,608,000
GBP
|
— | — | — |
383,818,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||
| Proceeds from issuing shares | — | — |
451,000
GBP
|
— | — | — |
-
GBP
|
— | — | — |
| Payments to acquire or redeem entity's shares | — | — |
-
GBP
|
— | — | — |
3,500,000
GBP
|
— | — | — |
| Proceeds from borrowings, classified as financing activities | — | — |
220,000,000
GBP
|
— | — | — |
475,000,000
GBP
|
— | — | — |
| Repayments of borrowings, classified as financing activities | — | — |
370,000,000
GBP
|
— | — | — |
275,000,000
GBP
|
— | — | — |
| Payments of lease liabilities, classified as financing activities | — | — |
15,7 45
GBP
|
— | — | — |
15,325,000
GBP
|
— | — | — |
| Dividends paid, classified as financing activities | — | — |
88,709,000
GBP
|
— | — | — |
-
GBP
|
— | — | — |
| Other inflows (outflows) of cash, classified as financing activities | — | — |
415,000
GBP
|
— | — | — |
555,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities | — | — |
254,908,000
GBP
|
— | — | — |
181,175,000
GBP
|
— | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — |
57,726,000
GBP
|
— | — | — |
20,97 4
GBP
|
— | — | — |
| Cash and cash equivalents |
398,714,000
GBP
|
— | — | — | — |
340,988,000
GBP
|
— | — |
340,988,000
GBP
|
361,962,000
GBP
|