Dr Michael Head from the University of Southampton added: "It should also be noted that of the 1,750 tests carried out so far in the UK, over 99% of those tested have been negative for the coronavirus.

"Thus, risks to Londoners and UK residents remain low, though people should continue to keep an eye on guidance for the general public."

While the patient has now been quarantined, Dr Thompson says the risk of the virus spreading depends on the woman's interactions prior to being placed in isolation.

"The key factor here is the number of contacts that this infected individual has had prior to being isolated," he said.

"If this is low, then the risk of sustained human-to-human transmission is also low."

As Public Health England investigates the patient's movements, Dr Nathalie MacDermott from the National Institute for Health Research said London commuters should continue to go about their business as usual.

"Provided the individual followed the government's advice (to self-isolate) there should be little concern of transmission to the general public in London," she said.

Britons quarantined at Arrowe Park Hospital two weeks ago let out

People have begun leaving Arrowe Park Hospital in Merseyside on Thursday, 14 days after they arrived on an evacuation flight.

All of the group - who had signed a contract agreeing to the quarantine period - have tested negative for the virus.

Matt Raw, 38, from Knutsford, Cheshire, shouted "We're free... and the sun's shining" as he left isolation at Arrowe Park Hospital in Wirral. He said: "Some good fresh air and very, very, very happy that all 83 of us have tested negative for the virus and I guess now back to business as usual.

"It is absolutely lovely to be out and I'll no doubt be going out for a pint a little bit later."

He added: "It has not been that bad because they have looked after us so excellently.

"The wonderful, wonderful staff of the NHS, they have really done their very best to make us as comfortable as possible.

"We're not prisoners. They're trying to make us feel like, if anything, we're just on holiday for a couple of weeks, maybe without the swimming pool."

NHS chief executive Sir Simon Stevens said: "As our first group of guests leaves Arrowe Park Hospital, we want to thank them for the highly responsible, pragmatic and stoical way they have played their part in keeping both themselves and others safe.

"They have set an important example, recognising that over the coming weeks many more of us may need to self-isolate at home for a period to reduce this virus's spread.

"I particularly also want to thank all the NHS staff who have worked so hard to make their stay as safe and comfortable as possible.

"With about 72 hours' notice they and subsequently their colleagues in Milton Keynes have mobilised clinical teams, personal support and pastoral care to look after over 200 people returning to this country under extremely trying circumstances.

"They have been hugely helped by the volunteers, residents, schools and those from local councils.

"While the NHS steps up, everyone can continue to play their part by taking simple steps such as washing hands to prevent the spread of infection and calling NHS 111 first before going to the doctors or A&E if they have any concerns about or show symptoms of the virus."

Health Secretary Matt Hancock said: "Today marks the end of 14 days of supported isolation for over 80 people in the Wirral.

"This will not have been an easy time for them and I would like to express my gratitude for their bravery and patience.

"Each individual has been given a clean bill of health, and the nation can be reassured that their departure presents no risk to the public.

"I am incredibly proud of every dedicated healthcare professional who has looked after these individuals over the last 14 days - their tireless work in exceptional circumstances is a testament to our steadfast NHS."

Businessman at centre of UK outbreak given the all-clear

Steve Walsh, the businessman at the centre of the UK outbreak of coronavirus, has been given the all-clear and discharged from hospital.

Mr Walsh, a 53-year-old scout leader from Hove in East Sussex, contracted coronavirus on a business trip to Singapore - and is linked to five other people diagnosed with it in the UK.

On his way back to the UK from Singapore, he stopped off at a ski region in France, where five other Britons were subsequently infected with coronavirus, now also known as Covid-19.