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Currency conversion - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
US dollar to Pound sterling [member] |  |  |
Disclosure Of Foreign Currency Translation [line items] |  |  |
Average exchange rate | 1.2604 | 1.2938 | 1.2765
Closing exchange rate | 1.2379 | 1.2695 | 1.3263
Euro to Pound sterling [member] |  |  |
Disclosure Of Foreign Currency Translation [line items] |  |  |
Average exchange rate | 1.1439 | 1.1453 | 1.1403
Closing exchange rate | 1.1010 | 1.1175 | 1.1813

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure Of Foreign Currency Translation. + References No definition available. + Details
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- Details
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- Details
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