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Income tax (Details) - GBP (£)				1 Months Ended	12 Months Ended
	Apr. 01, 2020	Mar. 11, 2020	Apr. 01, 2017	Sep. 30, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax rate [Abstract]
Deferred tax asset, unrecognised					£ 30,827,000	£ 20,820,000
Tax credit increase					33,852,000	23,007,000
Unused tax credits [Member]
Tax rate [Abstract]
Deferred tax asset, recognised					£ 2,230,000	£ 1,507,000
UK [Member]
Tax rate [Abstract]
Tax rate	17.00%	19.00%	19.00%	20.00%	19.00%	19.00%	19.00%

X

- Definition

The applicable income tax rate.

+ References

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-IssueDate 2020-01-01
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- References

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- Definition

The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]

+ References

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- Definition

The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

+ References

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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

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