Statement Of Cash Flows [Abstract]
| Concept |
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 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 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 |
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 2022-01-01 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||||||||
| Profit (loss) |
226,800,000
GBP
|
— |
–
GBP
|
1,300,000
GBP
|
228,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
68,000,000
GBP
|
158,800,000
GBP
|
–
GBP
|
— |
–
GBP
|
527,700,000
GBP
|
528,600,000
GBP
|
900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
44,000,000
GBP
|
483,700,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||||||||||||
| Adjustments for income tax expense |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
32,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for finance costs |
128,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
353,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories |
11,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
78,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Adjustments for provisions |
3,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other adjustments for non-cash items |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operations |
151,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
132,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities |
5,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities |
145,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
127,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities |
91,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
58,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities |
306,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
228,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities |
500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Interest received, classified as investing activities |
13,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities |
383,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
284,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||||||||
| Proceeds from issuing shares |
310,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
653,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Proceeds from issuing other equity instruments |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities |
129,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
172,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities |
7,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Interest paid, classified as financing activities |
122,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
141,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities |
59,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
315,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
177,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
157,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
392,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
583,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
418,900,000
GBP
|
418,900,000
GBP
|