Statement Of Financial Position [Abstract]
| Concept |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
As at 2021-01-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment |
611,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
646,500,000
GBP
|
— | — | — | — | — | — | — |
| Right-of-use assets |
30,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — |
| Goodwill |
449,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
718,600,000
GBP
|
— | — | — | — | — | — | — |
| Intangible assets other than goodwill |
51,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
47,100,000
GBP
|
— | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
31,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12,900,000
GBP
|
— | — | — | — | — | — | — |
| Inventories |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,300,000
GBP
|
— | — | — | — | — | — | — |
| Current tax assets |
4,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
4,300,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax assets |
16,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12,300,000
GBP
|
— | — | — | — | — | — | — |
| Trade and other receivables |
212,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
169,500,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents |
191,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
255,700,000
GBP
|
— | — | — | — |
166,900,000
GBP
|
— | — |
| Assets |
1,977,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,302,400,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital |
21,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
21,100,000
GBP
|
— | — | — | — | — | — | — |
| Retained earnings |
293,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
22,400,000
GBP
|
— | — | — | — | — | — | — |
| Share premium |
648,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
648,300,000
GBP
|
— | — | — | — | — | — | — |
| Equity |
369,500,000
GBP
|
8,900,000
GBP
|
12,100,000
GBP
|
21,100,000
GBP
|
3,200,000
GBP
|
648,300,000
GBP
|
293,500,000
GBP
|
21,100,000
GBP
|
700,000
GBP
|
648,300,000
GBP
|
22,400,000
GBP
|
7,400,000
GBP
|
800,000
GBP
|
652,900,000
GBP
|
1,900,000
GBP
|
21,000,000
GBP
|
648,300,000
GBP
|
200,000
GBP
|
680,700,000
GBP
|
5,800,000
GBP
|
7,300,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Trade and other payables |
197,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
199,700,000
GBP
|
— | — | — | — | — | — | — |
| Provisions [abstract] | |||||||||||||||||||||
| Provisions |
5,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,700,000
GBP
|
— | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities |
368,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
386,700,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax liabilities |
5,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
5,600,000
GBP
|
— | — | — | — | — | — | — |
| Liabilities |
1,608,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,649,500,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities |
1,977,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,302,400,000
GBP
|
— | — | — | — | — | — | — |