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Currency conversion - Additional Information (Detail) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
US dollar to Pound sterling [member] |  |  |
Statement [Line Items] |  |  |
Average exchange rate | 1.39 | 1.26 |
Closing exchange rate | 1.38 |  | 1.37
Euro to Pound sterling [member] |  |  |
Statement [Line Items] |  |  |
Average exchange rate | 1.15 | 1.14 |
Closing exchange rate | 1.16 |  | 1.12

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Statement + References No definition available. + Details
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- Details
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- Details
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