Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) investing activities [abstract] | ||
| Purchase of financial instruments, classified as investing activities |
190,400,000
GBP
|
251,500,000
GBP
|
| Proceeds from sales or maturity of financial instruments, classified as investing activities |
184,900,000
GBP
|
249,000,000
GBP
|