Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 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 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
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 |
2020-01-01 to 2020-12-31 |
As at 2020-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
3,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
8,000,000
GBP
|
5,000,000
GBP
|
97,000,000
GBP
|
–
GBP
|
–
GBP
|
96,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
1,000,000
GBP
|
–
GBP
|
96,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — | — | — | — | — |
111,000,000
GBP
|
— |
14 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
451,000,000
GBP
|
— |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
23,000,000
GBP
|
— |
35,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
35,000,000
GBP
|
— |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Interest received, classified as investing activities | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — | — | — | — | — |
289,000,000
GBP
|
— |
53,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — | — | — | — | — | — | — |
315,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Payments to acquire or redeem entity's shares | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — | — | — | — | — |
2 8
GBP
|
— |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — | — | — | — | — |
296,000,000
GBP
|
— |
105,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — | — | — | — | — | — |
118,000,000
GBP
|
— |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — |
784,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
656,000,000
GBP
|
— | — | — | — |
676,000,000
GBP
|