Statement Of Changes In Equity [Abstract]
| Concept |
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 |
|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||
| Statement of changes in equity [line items] | ||||||
| Increase (decrease) through exercise of options, equity |
0 .2
GBP
|
–
GBP
|
0 .2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Decrease (increase) through tax on share-based payment transactions, equity |
2,400,000
GBP
|
–
GBP
|
2,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|