A scientist advising the UK Government has warned the Beta variant of coronavirus spreading in France poses a “threat” to the UK with evidence suggesting it may evade the effect of vaccines.

Professor John Edmunds, of the London School of Hygiene and Tropical Medicine and a member of the Scientific Advisory Group for Emergencies (Sage), said he could understand concerns over the variant that have led to last-minute travel rule changes.

On Friday evening that holidaymakers returning from France must continue to quarantine – even if they have received both vaccines– when restrictions on other amber list countries are eased.

Ministers said the move was a precautionary measure due to concerns over the “persistent presence” of the Beta variant in the country.

READ MORE: France travel rules: Fully vaccinated travellers told to quarantine

Prof Edmunds told the BBC’s Radio 4 Today programme: “The Beta variant has remained a threat throughout. It is probably less infectious than the Delta variant that is spreading here in the UK at the moment. Where it has an advantage is that it is able to escape the immune response to a better extent.”

He added: “As the population here becomes more and more immune, the conditions are right then for the Beta variant to get an advantage, so I can understand the concern.

“Of the variants that are out there and are known about, that one has always been a threat to us. There is some good evidence from South Africa that it can evade the immune response generated by the AstraZeneca vaccine more efficiently.”

The Oxford/AstraZeneca jab is among the four approved vaccines administered to millions of people in the UK in recent months.

HEALTH Coronavirus(PA Graphics)

From Monday, travellers returning to England from all amber list countries except France will not need to quarantine on arrival if they have been double vaccinated or are under the age of 18.

The Scottish Government has not yet made a decision on whether or not travellers returning from the country will have to isolate yet, but said the decision 'will be taken by Ministers on the basis of evidence and with the safety of our communities as our primary concern'.

A Scottish Government spokesperson said: “We are considering the best approach for Scotland as we look to adopt a four-nation approach on international travel, where possible. Decisions on border health measures are a devolved matter and will be taken by Ministers on the basis of evidence and with the safety of our communities as our primary concern.”

READ MORE: Covid: Scottish Government ‘considering best approach’ for travellers returning from France

The France announcement underlines the uncertainty in some areas over the lifting of lockdown restrictions in England from July 19.

It also came just two days after the Spanish holiday islands of Ibiza, Mallorca and Menorca were moved from green to amber, meaning anyone over 18 who is not fully vaccinated must quarantine on their return.

Health Secretary Sajid Javid said the Government had always been clear it would take rapid action at the borders to “protect the gains made by our successful vaccination programme”, while Labour accused ministers of creating holiday “chaos”.

Shadow home secretary Nick Thomas-Symonds said: “Ministers are making up rules on the hoof and causing chaos.

“They have never had a proper strategy in place – once again the travel industry and the British people are paying the price.”