Disclosure Of Income Tax [Text Block]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|
| Disclosure of income tax [text block] | — | — | — | — | — | — | — | — |
| Major components of tax expense (income) [abstract] | ||||||||
| Tax expense (income) | — |
1 2 .1
GBP
|
5 4. 3
GBP
|
6 6 .4
GBP
|
— |
4 0 .1
GBP
|
2 2 .9
GBP
|
63,000,000
GBP
|
| Income tax relating to components of other comprehensive income [abstract] | ||||||||
| Income tax relating to cash flow hedges included in other comprehensive income | — | — | — |
37 .6
GBP
|
— |
12. 3
GBP
|
— | — |
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — |
7. 2
GBP
|
— |
0. 3
GBP
|
— | — |
| Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income | — | — | — |
7. 7
GBP
|
— |
11 .7
GBP
|
— | — |
| Disclosure of temporary difference, unused tax losses and unused tax credits [text block] | — | — | — | — | — | — | — | — |
| Disclosure of temporary difference, unused tax losses and unused tax credits [abstract] | ||||||||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||||||||
| Deferred tax assets and liabilities [abstract] | ||||||||
| Deferred tax assets |
28. 7
GBP
|
— | — | — |
65. 3
GBP
|
— | — | — |
| Deferred tax liabilities |
2 25. 3
GBP
|
— | — | — |
222,000,000
GBP
|
— | — | — |
| Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |