The World Health Organization (WHO) says it is in talks with authorities in the UK on the development of a new form of cholera that is more dangerous and nearly 70 per cent on the first victim.
The British government says the new species has already begun to spread in London.
A BBC correspondent says authorities are realizing they need to take new steps as a matter of urgency given the new numbers of infected people are on the rise.
The government has announced new locks that have already taken effect on Saturday night.
Speaking from Downing Street Palace, Prime Minister Boris Johnson said there was no question of flexibility on Christmas Eve as previously promised.
The Netherlands has already closed its doors to any aircraft coming from the UK after a man was found to be carrying a new strain of Covid-19.