Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
159,400,000
GBP
|
— | — | — | — | — | — | — | — |
137,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
616,300,000
GBP
|
— | — | — | — | — | — | — | — |
529,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
14,200,000
GBP
|
— | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
4,101,100,000
GBP
|
— | — | — | — | — | — | — | — |
3,825,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||||
| Current inventories |
1,621,100,000
GBP
|
— | — | — | — | — | — | — | — |
1,748,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
1,578,500,000
GBP
|
— | — | — | — | — | — | — | — |
1,557,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
1,426,100,000
GBP
|
— | — | — | — | — | — | — | — |
1,504,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets |
4,646,100,000
GBP
|
— | — | — | — | — | — | — | — |
4,841,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
8,747,200,000
GBP
|
— | — | — | — | — | — | — | — |
8,666,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Issued capital |
108,600,000
GBP
|
— | — | — | — | — | — | — | — |
108,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
2,806,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,469,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
205,200,000
GBP
|
— | — | — | — | — | — | — | — |
199,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
16,700,000
GBP
|
— | — | — | — | — | — | — | — |
17,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
2,966,300,000
GBP
|
— | — | — | — | — | — | — | — |
2,720,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
2,966,300,000
GBP
|
2,876,900,000
GBP
|
16,100,000
GBP
|
205,200,000
GBP
|
108,600,000
GBP
|
170,200,000
GBP
|
70,900,000
GBP
|
2,500,000
GBP
|
1,900,000
GBP
|
2,720,900,000
GBP
|
199,400,000
GBP
|
16,100,000
GBP
|
2,532,900,000
GBP
|
108,500,000
GBP
|
74,200,000
GBP
|
2,500,000
GBP
|
63,400,000
GBP
|
900,000
GBP
|
400,000
GBP
|
269,200,000
GBP
|
2,217,000,000
GBP
|
194,200,000
GBP
|
108,400,000
GBP
|
2,216,500,000
GBP
|
2,500,000
GBP
|
16,100,000
GBP
|
52,900,000
GBP
|
2,500,000
GBP
|
400,000
GBP
|
2,203,900,000
GBP
|
16,100,000
GBP
|
194,200,000
GBP
|
12,600,000
GBP
|
12,600,000
GBP
|
108,400,000
GBP
|
269,200,000
GBP
|
2,204,400,000
GBP
|
52,900,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||||||||
| Non-current provisions |
75,800,000
GBP
|
— | — | — | — | — | — | — | — |
50,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
190,100,000
GBP
|
— | — | — | — | — | — | — | — |
192,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, non-current |
500,000
GBP
|
— | — | — | — | — | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
2,470,300,000
GBP
|
— | — | — | — | — | — | — | — |
2,480,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||||||||
| Current provisions |
10,000,000
GBP
|
— | — | — | — | — | — | — | — |
24,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
2,071,600,000
GBP
|
— | — | — | — | — | — | — | — |
2,249,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
47,000,000
GBP
|
— | — | — | — | — | — | — | — |
40,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
3,310,600,000
GBP
|
— | — | — | — | — | — | — | — |
3,465,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
5,780,900,000
GBP
|
— | — | — | — | — | — | — | — |
5,945,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
8,747,200,000
GBP
|
— | — | — | — | — | — | — | — |
8,666,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |