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Loss Before Tax - Summary of Loss Before Tax Stated After Charging (Detail) - GBP (£) £ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Material Income And Expense [Abstract]
Amortization	£ 478	£ 377	£ 230
Depreciation	£ 412	£ 341	£ 141

X

- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
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-URIDate 2020-01-01

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X

- References

No definition available.

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