Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
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 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
2 55.4
GBP
|
— |
—
GBP
|
2 55.4
GBP
|
—
GBP
|
— |
—
GBP
|
56 1 .0
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
56 1.0
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||
| Adjustments for income tax expense | — | — |
96,400,000
GBP
|
— | — | — | — | — | — |
1 69.7
GBP
|
— | — | — | — | — |
| Adjustments for finance costs | — | — |
1 4.8
GBP
|
— | — | — | — | — | — |
4,100,000
GBP
|
— | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — |
235,300,000
GBP
|
— | — | — | — | — | — |
53 2.5
GBP
|
— | — | — | — | — |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — | — |
7. 6
GBP
|
— | — | — | — | — | — |
6,600,000
GBP
|
— | — | — | — | — |
| Adjustments for provisions | — | — |
—
GBP
|
— | — | — | — | — | — |
2 7 5.0
GBP
|
— | — | — | — | — |
| Adjustments for share-based payments | — | — |
4,500,000
GBP
|
— | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — |
| Other adjustments for non-cash items | — | — |
8,900,000
GBP
|
— | — | — | — | — | — |
7 .9
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operations | — | — |
65,600,000
GBP
|
— | — | — | — | — | — |
566,300,000
GBP
|
— | — | — | — | — |
| Dividends received, classified as operating activities | — | — |
—
GBP
|
— | — | — | — | — | — |
—
GBP
|
— | — | — | — | — |
| Interest paid, classified as operating activities | — | — |
4,300,000
GBP
|
— | — | — | — | — | — |
3,300,000
GBP
|
— | — | — | — | — |
| Interest received, classified as operating activities | — | — |
11 . 7
GBP
|
— | — | — | — | — | — |
3,500,000
GBP
|
— | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — |
7 1 .6
GBP
|
— | — | — | — | — | — |
1 64.2
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operating activities | — | — |
1 29.8
GBP
|
— | — | — | — | — | — |
402,300,000
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
|
— | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — |
1. 0
GBP
|
— | — | — | — | — | — |
900,000
GBP
|
— | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — |
36,400,000
GBP
|
— | — | — | — | — | — |
30,500,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities | — | — |
42,900,000
GBP
|
— | — | — | — | — | — |
2 9.8
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||
| Payments to acquire or redeem entity's shares | — | — |
1 .2
GBP
|
— | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — |
3,000,000
GBP
|
— | — | — | — | — | — |
3,300,000
GBP
|
— | — | — | — | — |
| Dividends paid, classified as financing activities | — | — |
255,400,000
GBP
|
— | — | — | — | — | — |
7 50.1
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities | — | — |
268,800,000
GBP
|
— | — | — | — | — | — |
7 5 7 .5
GBP
|
— | — | — | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — |
44 1 .5
GBP
|
— | — | — | — | — | — |
385,000,000
GBP
|
— | — | — | — | — |
| Cash and cash equivalents | — | — | — |
420,100,000
GBP
|
— | — | — |
86 1 .6
GBP
|
— | — | — | — | — | — |
1 ,2 46.6
GBP
|