Statement Of Financial Position [Abstract]
| Concept |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2023-07-01 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2022-07-02 |
As at 2021-06-27 |
As at 2021-06-27 |
As at 2021-06-27 |
As at 2021-06-27 |
As at 2021-06-27 |
As at 2021-06-27 |
As at 2021-06-26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — |
169,900,000
GBP
|
173,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — |
231,300,000
GBP
|
248,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — | — | — | — |
5,300,000
GBP
|
9,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — |
6,900,000
GBP
|
4,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — |
413,400,000
GBP
|
440,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||
| Current inventories | — | — | — | — | — | — |
211,000,000
GBP
|
223,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — | — | — |
24,300,000
GBP
|
22,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
46,300,000
GBP
|
30,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
128,600,000
GBP
|
| Current assets | — | — | — | — | — | — |
283,400,000
GBP
|
297,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — |
696,800,000
GBP
|
737,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
2,000,000
GBP
|
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
97,500,000
GBP
|
111,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — |
1,700,000
GBP
|
1,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — |
137,500,000
GBP
|
178,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
6,900,000
GBP
|
137,500,000
GBP
|
1,700,000
GBP
|
43,200,000
GBP
|
97,500,000
GBP
|
2,000,000
GBP
|
— | — |
1,700,000
GBP
|
2,000,000
GBP
|
20,200,000
GBP
|
43,200,000
GBP
|
111,200,000
GBP
|
178,300,000
GBP
|
1,600,000
GBP
|
2,000,000
GBP
|
4,300,000
GBP
|
43,200,000
GBP
|
238,700,000
GBP
|
281,200,000
GBP
|
— |
| Liabilities [abstract] | |||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — |
5,900,000
GBP
|
5,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — |
289,700,000
GBP
|
283,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||
| Trade and other current payables | — | — | — | — | — | — |
208,100,000
GBP
|
223,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — |
269,600,000
GBP
|
276,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
559,300,000
GBP
|
559,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |