Chief medical officer for the government, Professor Chris Whitty, said that most people with minor cases of the virus will no longer be hospitalised.
She was admitted to the Royal Berkshire Hospital in Reading on Wednesday, where she tested positive for Covid-19, and died the following day.
"The man, who had underlying health conditions, tested positive for coronavirus shortly before his death on Thursday, March 5".
"Eight patients were identified in the United Kingdom where it is not yet clear whether they contracted it directly or indirectly from an individual who had recently returned from overseas", he added.
Britain has so far registered 90 cases of coronavirus, also known as COVID-19, which started in China, but has held off from introducing measures to restrict movement or to cancel large gatherings for fear of hurting the economy.
"In something like this, what the scientists say is you've got a range of things that you can do to arrest or check the spread of a disease", he said.
A total of 25 new cases in England were announced on Thursday - 17 of whom had recently travelled from countries or clusters already under investigation, and eight of whom contracted the virus in the UK.
On Wednesday, Government advice was updated to urge anyone returning to the United Kingdom from "lockdown" areas in northern Italy to self-isolate regardless of whether they have symptoms, while travellers from any other part of the country should call 111 or self-isolate if they feel unwell.
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He said Britain's official response had gone from "mainly contain with some delay" to "mainly delay".
UK Prime Minister Boris Johnson warned the virus was now likely to spread significantly in Britain.
Giving evidence to the Health Select Committee, Prof Chris Whitty said: 'I'm expecting the number only to go up'.
Whitty, questioned by lawmakers, said Britain had mainly moved into the second stage and was now considering measures to try to delay the peak of an epidemic which officials are anticipating in the coming weeks.
However, he said other existing treatments may work in high-risk groups although they would not be "perfect".
"It is now highly likely that the virus is going to spread in a significant way", the spokesman said.
Those who get more seriously ill tend to do so after about five or six days of having the illness.