Statement Of Financial Position [Abstract]
| Concept |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | — | — | — | — |
398,000,000
GBP
|
— | — | — | — | — | — | — | — |
406,000,000
GBP
|
— | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — |
867,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,013,000,000
GBP
|
— | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — |
48,000,000
GBP
|
— | — | — | — | — | — | — | — |
52,000,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — |
233,000,000
GBP
|
— | — | — | — | — | — | — | — |
208,000,000
GBP
|
— | — | — | — | — | — | — |
| Non-current assets | — | — | — | — |
1,775,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,946,000,000
GBP
|
— | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||
| Current inventories | — | — | — | — |
424,000,000
GBP
|
— | — | — | — | — | — | — | — |
507,000,000
GBP
|
— | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — |
309,000,000
GBP
|
— | — | — | — | — | — | — | — |
340,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — |
813,000,000
GBP
|
— | — | — | — | — | — | — | — |
441,000,000
GBP
|
— | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — |
| Current assets | — | — | — | — |
1,652,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,424,000,000
GBP
|
— | — | — | — | — | — | — |
| Assets | — | — | — | — |
3,427,000,000
GBP
|
— | — | — | — | — | — | — | — |
3,370,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Retained earnings | — | — | — | — |
466,000,000
GBP
|
— | — | — | — | — | — | — | — |
675,000,000
GBP
|
— | — | — | — | — | — | — |
| Share premium | — | — | — | — |
231,000,000
GBP
|
— | — | — | — | — | — | — | — |
231,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — |
914,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,147,000,000
GBP
|
— | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity |
–
GBP
|
7,000,000
GBP
|
217,000,000
GBP
|
914,000,000
GBP
|
921,000,000
GBP
|
466,000,000
GBP
|
231,000,000
GBP
|
–
GBP
|
231,000,000
GBP
|
241,000,000
GBP
|
1,147,000,000
GBP
|
7,000,000
GBP
|
675,000,000
GBP
|
1,154,000,000
GBP
|
–
GBP
|
1,539,000,000
GBP
|
1,026,000,000
GBP
|
230,000,000
GBP
|
277,000,000
GBP
|
1,533,000,000
GBP
|
6,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||||||||
| Non-current provisions | — | — | — | — |
33,000,000
GBP
|
— | — | — | — | — | — | — | — |
37,000,000
GBP
|
— | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — | — |
54,000,000
GBP
|
— | — | — | — | — | — | — | — |
63,000,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — |
1,395,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,359,000,000
GBP
|
— | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||||
| Current provisions | — | — | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — |
20,000,000
GBP
|
— | — | — | — | — | — | — |
| Trade and other current payables | — | — | — | — |
405,000,000
GBP
|
— | — | — | — | — | — | — | — |
439,000,000
GBP
|
— | — | — | — | — | — | — |
| Current liabilities | — | — | — | — |
1,111,000,000
GBP
|
— | — | — | — | — | — | — | — |
857,000,000
GBP
|
— | — | — | — | — | — | — |
| Liabilities | — | — | — | — |
2,506,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,216,000,000
GBP
|
— | — | — | — | — | — | — |