London (CNN) UK Prime Minister Boris Johnson is facing pressure over his alleged relationship with the American businesswoman Jennifer Arcuri during the time he served as the Mayor of London.

Johnson has been given 14 days to provide the details of the relationship after the Sunday Times reported that a company run by the tech entrepreneur received tens of thousands of pounds in public funding when Johnson was mayor.

Boris Johnson and Jennifer Arcuri pictured together at a tech conference in London in 2014.

The company also had access to overseas trade missions headed by the then mayor, according to the newspaper. The Sunday Times alleged Arcuri was given preferential treatment when it came to joining the missions, despite her business "not meeting the eligibility criteria for any of the three Johnson trade missions she attended in the space of just a year."

The Oversight Committee of the Greater London Authority has asked Johnson to disclose details and a timeline of all contact with Arcuri during his 2008-16 mayoral term. They also want the PM to explain how that alleged personal relationship was disclosed at the time Arcuri was awarded the grants.

Arcuri and her company did not respond to CNN's request for comment. She told the Sunday Times any grants received and any trade mission I joined were purely in respect of my role as a legitimate businesswoman."

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