Statement Of Financial Position [Abstract]
| Concept |
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 |
As at 2020-01-31 |
As at 2020-01-31 |
As at 2020-01-31 |
As at 2020-01-31 |
As at 2020-01-31 |
As at 2020-01-31 |
As at 2020-01-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — |
646,500,000
GBP
|
— | — | — | — |
660,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — |
36,000,000
GBP
|
— | — | — | — |
2,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — | — | — | — |
718,600,000
GBP
|
— | — | — | — |
718,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — | — | — | — |
47,100,000
GBP
|
— | — | — | — |
56,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | — | — | — | — | — | — |
12,900,000
GBP
|
— | — | — | — |
16,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Inventories | — | — | — | — | — | — |
6,300,000
GBP
|
— | — | — | — |
3,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current tax assets | — | — | — | — | — | — |
4,300,000
GBP
|
— | — | — | — |
3,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — |
12,300,000
GBP
|
— | — | — | — |
12,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other receivables | — | — | — | — | — | — |
169,500,000
GBP
|
— | — | — | — |
183,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
255,700,000
GBP
|
— | — | — | — |
166,900,000
GBP
|
— | — | — | — | — | — | — | — |
139,100,000
GBP
|
| Assets | — | — | — | — | — | — |
2,302,400,000
GBP
|
— | — | — | — |
2,212,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
21,100,000
GBP
|
— | — | — | — |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
22,400,000
GBP
|
— | — | — | — |
200,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — |
648,300,000
GBP
|
— | — | — | — |
648,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
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
|
21,000,000
GBP
|
648,300,000
GBP
|
1,900,000
GBP
|
200,000
GBP
|
680,700,000
GBP
|
5,800,000
GBP
|
7,300,000
GBP
|
4,900,000
GBP
|
7,800,000
GBP
|
65,400,000
GBP
|
20,400,000
GBP
|
11,200,000
GBP
|
519,300,000
GBP
|
588,200,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Trade and other payables | — | — | — | — | — | — |
199,700,000
GBP
|
— | — | — | — |
175,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Provisions [abstract] | |||||||||||||||||||||
| Provisions | — | — | — | — | — | — |
6,700,000
GBP
|
— | — | — | — |
11,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities | — | — | — | — | — | — |
386,700,000
GBP
|
— | — | — | — |
426,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — | — | — | — |
5,600,000
GBP
|
— | — | — | — |
5,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
1,649,500,000
GBP
|
— | — | — | — |
1,532,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — | — | — |
2,302,400,000
GBP
|
— | — | — | — |
2,212,700,000
GBP
|
— | — | — | — | — | — | — | — | — |