Boris Johnson vowed to work closely with Mr Biden when it became clear he had deposed Mr Trump in November’s bitterly-fought US election. He said: “The Prime Minister of the United Kingdom is always going to work very, very closely with whoever is the president of the United States.”
But it is still unclear what the US-UK relationship will look like after Mr Biden’s January 20 inauguration.
One former US diplomat said: “The UK Government continued to believe Trump was going to do favours for them and that hasn’t panned out.
“The trade deal was going to happen in a matter of weeks, then months, and it’s now four years later and it hasn’t happened.”
Despite the fears over a delayed trade deal, a Government spokesman said both sides were ready to secure a deal to aid economic recovery from the pandemic.
The spokesman said: “From the outset, we have engaged with US partners on a bipartisan basis — at the federal and state level.
“This agreement would support both of our economies to build back better from Covid-19.”
Some US and UK officials believe Britain will not see a trade deal for some time amid suggestions Mr Biden’s team will look form greater ties with France and Germany.
Secretary of State in waiting Anthony Blinken has described Brexit as a mess while Mr Biden himself served under Barack Obama who was strongly opposed to Brexit and even warned of the consequences to transatlantic trade if the UK left the EU.
Mr Biden had also warned no trade deal could be done with Britain if the terms of the Northern Ireland Good Friday Agreement were breached by the Internal Markets Bill although the legislation was eventually dropped.
Charles Kupchan, a former official at the National Security Council for European Affairs, said London will nevertheless be further down the list of priorities for the White House as a result of its departure from the EU.
He said: “When you wanted to get something done with Europe, you made the first or perhaps second call to London.
Former deputy ambassador to the UK, Lewis Lukens, also claimed the new administration will have too many domestic issues to deal with first before a trade deal with Britain and said a new trade deal in 2021 will be unlikely despite the UK’s needs to agree one.
He said: “I’d say the best case scenario for a deal is 2022.”
According to 2018 figures, the US was the UK’s largest trading partner.
Trade with the US amounted to £201.6billion, which was 15 percent of the UK’s total trade.