Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2023-01-31 |
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2022-02-01 to 2023-01-31 |
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As at 2021-01-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — |
c) Fair values
|
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| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||
| Assets |
1,977,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,302,400,000
GBP
|
— | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||
| Liabilities |
1,608,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,649,500,000
GBP
|
— | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||
| 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
|
648,300,000
GBP
|
21,000,000
GBP
|
200,000
GBP
|
680,700,000
GBP
|
5,800,000
GBP
|
7,300,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |