Statement Of Cash Flows [Abstract]
| Concept |
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 |
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 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 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] | |||||||||||||||||||||||||||
| Profit (loss) |
2,300,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
40,200,000
GBP
|
229,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
189,300,000
GBP
|
191. 6
GBP
|
4 10.5
GBP
|
–
GBP
|
–
GBP
|
4 19.3
GBP
|
–
GBP
|
1 33.7
GBP
|
2 76.8
GBP
|
— |
–
GBP
|
–
GBP
|
8,800,000
GBP
|
–
GBP
|
–
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||||||||
| Adjustments for income tax expense | — | — | — | — | — | — | — | — | — | — | — |
24,500,000
GBP
|
— |
5 5.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for finance costs | — | — | — | — | — | — | — | — | — | — | — |
137,300,000
GBP
|
— |
143,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — | — | — | — | — | — | — | — | — | — |
7,700,000
GBP
|
— |
4,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for provisions | — | — | — | — | — | — | — | — | — | — | — |
200,000
GBP
|
— |
11,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Other adjustments for non-cash items | — | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— |
2,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operations | — | — | — | — | — | — | — | — | — | — | — |
179,800,000
GBP
|
— |
1 88.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— |
9,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — | — | — | — | — |
178,900,000
GBP
|
— |
1 98.6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
40,700,000
GBP
|
— |
8 1.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
144,000,000
GBP
|
— |
1 79.7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash advances and loans made to other parties, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
1,400,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
900,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Interest received, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
1,100,000
GBP
|
— |
2,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — | — | — | — | — |
184,100,000
GBP
|
— |
2 58.4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
812,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Proceeds from issuing other equity instruments | — | — | — | — | — | — | — | — | — | — | — |
15,300,000
GBP
|
— |
34,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — | — | — | — | — | — |
37,300,000
GBP
|
— |
1,092,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — | — | — | — | — |
9,900,000
GBP
|
— |
1 2.2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Interest paid, classified as financing activities | — | — | — | — | — | — | — | — | — | — | — |
118,000,000
GBP
|
— |
8 2.3
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — | — | — | — | — |
66,500,000
GBP
|
— |
840,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — | — | — | — | — | — |
71,700,000
GBP
|
— |
383,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— |
1,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
418,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
489,400,000
GBP
|
— | — | — | — | — |
107,900,000
GBP
|