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 |
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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||
| Revenue | — | — | — | — | — | — | — |
615. 8
GBP
|
— | — | — |
5 9 8. 0
GBP
|
— | — | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||||
| Operating expense | — | — | — | — | — | — | — |
5 33 .2
GBP
|
— | — | — |
5 35.0
GBP
|
— | — | — | — | — | — |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations |
0 .7
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1 4 .1
GBP
|
1 4 .1
GBP
|
14 . 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1. 4
GBP
|
1,100,000
GBP
|
300,000
GBP
|
–
GBP
|
1,100,000
GBP
|
–
GBP
|
–
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 .1
GBP
|
— | — | — |
0 .1
GBP
|
— | — | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income |
0. 2
GBP
|
–
GBP
|
–
GBP
|
1. 0
GBP
|
–
GBP
|
1 4 .1
GBP
|
4 8. 2
GBP
|
4 8.0
GBP
|
61. 3
GBP
|
0 .8
GBP
|
–
GBP
|
0. 9
GBP
|
–
GBP
|
0 .1
GBP
|
–
GBP
|
0. 8
GBP
|
–
GBP
|
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — |
4 8. 2
GBP
|
— | — | — |
0. 8
GBP
|
— | — | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — |
0. 2
GBP
|
— | — | — |
0 .1
GBP
|
— | — | — | — | — | — |