Brussels is reviewing whether to grant long-term clearing access, but in the meantime is piling pressure on euro zone banks to shift their derivatives clearing business from the LSE to rivals like Eurex on the continent.
The official, who declined to be named, said the postponement was due to a lack of clarity about the diplomatic status of EU representatives in Britain.
A British government source declined to comment on the postponement of Croisdale-Appleby's meeting and said the diplomatic status issue remained subject to negotiation.
"I think we need to make sure that the vaccine supply that has been bought and paid for, procured for those in the UK, is delivered," Gove told LBC Radio.
"But of course, we're always going to work with our friends and neighbours, we have to make sure that we can do everything we can to help them."
Britain, in lockdown since Jan. 4, on Wednesday clamped down on travel, requiring people arriving from high-risk COVID-19 countries to quarantine for 10 days and barring outbound trips for all but exceptional reasons.
The move has put a brake on a massive spending spree in Hong Kong by mainland traders looking to take advantage of relatively cheap shares in the city.
The Foreign Minister said that the Senate Standing Committee lauded the efforts of the Ministry of Foreign Affairs for the acquisition of Covid-19 vaccine.
Vaccine rollouts in the European Union have been slow compared with some other regions.
In a further sign of fraught relations, a second EU official said the company had pulled out of a meeting with the European Union scheduled for Wednesday.
The daily number of new coronavirus infections in France stayed above 20,000 on average for the fourth straight day on Tuesday, while hospitalisations reached an eight-week high of 27,041.
European Union governments plan to remove Japan from their list of nations whose residents should be allowed to visit the bloc during the ongoing phase of the coronavirus outbreak.
British officials have approved the sale of arms to nearly four-fifths of countries subject to arms embargos, sanctions and other restrictions, over the past five years.
The United Kingdom has exported military hardware to 58 countries, out of 73 listed as subject to restrictions by the Department for International Trade, including Pakistan, Kenya and China.
More than one in three Londoners would consider leaving the UK capital, with all citing Brexit uncertainty and the pandemic as deciding factors for them.
The letter adds to tension between the European Union and the U.S. drug-maker, which announced last week a temporary slowdown in deliveries to the bloc.