Analysis Of Income And Expense [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 |
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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||
| Revenue [abstract] | ||||||||||||||||
| Revenue | — | — | — | — | — | — |
1 , 292 .0
GBP
|
— | — | — |
1, 3 36. 2
GBP
|
— | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||
| Sales and marketing expense | — | — | — | — | — | — |
242 .1
GBP
|
— | — | — |
268 . 3
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — | — | — | — |
0 .7
GBP
|
— | — | — |
1 . 3
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — | — |
0. 3
GBP
|
— | — | — |
0 .1
GBP
|
— | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income |
–
GBP
|
–
GBP
|
1 .6
GBP
|
–
GBP
|
31 .8
GBP
|
–
GBP
|
3 12.5
GBP
|
34 5.9
GBP
|
9 .7
GBP
|
–
GBP
|
10. 8
GBP
|
0. 6
GBP
|
–
GBP
|
0. 5
GBP
|
–
GBP
|
–
GBP
|