Derivative Financial Instruments - Summary of Derivatives Carried at Fair Value (Details) £ in Thousands	Dec. 31, 2020 GBP (£)
Changes In Fair Value Of Credit Derivative [Abstract]
Derivative financial instrument	£ 1,492

The amount of current derivative financial assets. [Refer: Derivative financial assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2021-03-24

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