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Leases - Summary of Carrying Amounts of Lease Liabilities (Detail) - GBP (£) £ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease Liabilities [Abstract]
At January 1	£ 806	£ 434
Additions		548
Re-measurement of liability	115	2
Accretion of interest	26	21
Payments	(297)	(197)
Effect of foreign currency exchange differences	(5)	(2)
At December 31	645	806
Current	278	268
Non-current	£ 367	£ 538

X

- Definition

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 16
-IssueDate 2020-01-01
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X

- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

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-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 47
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X

- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
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X

- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
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- Definition

The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities]

+ References

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X

- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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-IssueDate 2020-01-01
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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

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- References

No definition available.

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X

- Definition

The amount of non-current lease liabilities. [Refer: Lease liabilities]

+ References

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