Statement Of Financial Position [Abstract]
| Concept |
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 |
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 |
As at 2021-10-31 |
As at 2021-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
As at 2020-10-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||
| Property, plant and equipment | — |
231,300,000
GBP
|
— | — | — | — |
198,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill | — |
118,100,000
GBP
|
— | — | — | — |
108,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — |
32,300,000
GBP
|
— | — | — | — |
18,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — |
438,900,000
GBP
|
— | — | — | — |
383,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||
| Current inventories | — |
99,600,000
GBP
|
— | — | — | — |
80,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — |
61,100,000
GBP
|
— | — | — | — |
60,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
19,800,000
GBP
|
— | — | — | — |
5,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets | — |
181,200,000
GBP
|
— | — | — | — |
148,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — |
620,100,000
GBP
|
— | — | — | — |
531,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||
| Issued capital | — |
2,800,000
GBP
|
— | — | — | — |
2,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — |
87,200,000
GBP
|
— | — | — | — |
56,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — |
307,700,000
GBP
|
— | — | — | — |
307,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
7,500,000
GBP
|
418,100,000
GBP
|
2,800,000
GBP
|
307,700,000
GBP
|
87,200,000
GBP
|
12,900,000
GBP
|
352,800,000
GBP
|
27,100,000
GBP
|
2,800,000
GBP
|
307,100,000
GBP
|
900,000
GBP
|
—
GBP
|
27,100,000
GBP
|
12,900,000
GBP
|
307,100,000
GBP
|
2,800,000
GBP
|
12,900,000
GBP
|
57,100,000
GBP
|
352,800,000
GBP
|
56,200,000
GBP
|
2,800,000
GBP
|
1,000,000
GBP
|
18,900,000
GBP
|
28,000,000
GBP
|
306,700,000
GBP
|
12,900,000
GBP
|
2,900,000
GBP
|
329,600,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||
| Non-current provisions | — |
16,800,000
GBP
|
— | — | — | — |
14,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — |
45,200,000
GBP
|
— | — | — | — |
30,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — |
88,300,000
GBP
|
— | — | — | — |
76,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||
| Current provisions | — |
1,600,000
GBP
|
— | — | — | — |
2,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — |
98,200,000
GBP
|
— | — | — | — |
85,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — |
113,700,000
GBP
|
— | — | — | — |
102,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — |
202,000,000
GBP
|
— | — | — | — |
178,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |