Statement Of Financial Position [Abstract]
| Concept |
As at 2023-10-31 |
As at 2023-10-31 |
As at 2023-10-31 |
As at 2023-10-31 |
As at 2023-10-31 |
As at 2023-10-31 |
As at 2022-10-31 |
As at 2022-10-31 |
As at 2022-10-31 |
As at 2022-10-31 |
As at 2022-10-31 |
As at 2022-10-31 |
As at 2021-10-31 |
As at 2021-10-31 |
As at 2021-10-31 |
As at 2021-10-31 |
As at 2021-10-31 |
As at 2021-10-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
242,200,000
GBP
|
— | — | — | — | — |
231,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Goodwill |
100,500,000
GBP
|
— | — | — | — | — |
118,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
36,900,000
GBP
|
— | — | — | — | — |
32,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
412,700,000
GBP
|
— | — | — | — | — |
438,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories |
101,700,000
GBP
|
— | — | — | — | — |
99,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
74,800,000
GBP
|
— | — | — | — | — |
61,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
6,400,000
GBP
|
— | — | — | — | — |
19,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets |
183,700,000
GBP
|
— | — | — | — | — |
181,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets |
596,400,000
GBP
|
— | — | — | — | — |
620,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
2,800,000
GBP
|
— | — | — | — | — |
2,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
62,900,000
GBP
|
— | — | — | — | — |
87,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium |
308,700,000
GBP
|
— | — | — | — | — |
307,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
378,500,000
GBP
|
62,900,000
GBP
|
308,700,000
GBP
|
2,800,000
GBP
|
8,800,000
GBP
|
12,900,000
GBP
|
418,100,000
GBP
|
2,800,000
GBP
|
7,500,000
GBP
|
307,700,000
GBP
|
87,200,000
GBP
|
12,900,000
GBP
|
352,800,000
GBP
|
307,100,000
GBP
|
27,100,000
GBP
|
12,900,000
GBP
|
2,800,000
GBP
|
57,100,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions |
12,000,000
GBP
|
— | — | — | — | — |
16,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
43,800,000
GBP
|
— | — | — | — | — |
45,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
75,800,000
GBP
|
— | — | — | — | — |
88,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
5,600,000
GBP
|
— | — | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
124,000,000
GBP
|
— | — | — | — | — |
98,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
142,100,000
GBP
|
— | — | — | — | — |
113,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
217,900,000
GBP
|
— | — | — | — | — |
202,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |