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Leases - Summary of Maturity Analysis of Lease Liabilities Extension Options Not Expected to be Exercised (Detail) - GBP (£) £ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Extension options not expected to be exercised | £ 978 | £ 978
Not later than 5 years [member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Extension options not expected to be exercised | 591 | 351
Later than 5 years [member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Extension options not expected to be exercised | £ 387 | £ 627

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