Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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As at 2020-03-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | |||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | |||||||||||||||||||||
| Equity |
0 .1
GBP
|
1. 5
GBP
|
8 .1
GBP
|
12 . 8
GBP
|
30,300,000
GBP
|
17 3 . 3
GBP
|
20 0.3
GBP
|
0 .1
GBP
|
12 8 .1
GBP
|
14 8. 4
GBP
|
8 .1
GBP
|
3 0. 2
GBP
|
1. 5
GBP
|
16. 4
GBP
|
2 1.7
GBP
|
10 4. 4
GBP
|
0. 4
GBP
|
2 9.9
GBP
|
—
GBP
|
8 .1
GBP
|
8 8.5
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |