BRITS were last night dealt a huge summer holiday blow as Boris Johnson issued a warning about the third wave ripping through Europe.
It comes as France could be slapped on the UK's travel red-list - forcing a ten-day isolation for when travellers return.
Ministers are concerned about France, where up to 40 per cent of cases are said to be worrying variants like the South African strain.
The PM told MPs: "I'm afraid we cant rule out tougher measures and we will put them in if necessary".
On April 5 he will reveal more details of what experts will recommend for after lockdown is lifted - as no final decisions have been made.
But Mr Johnson warned: "It's looking difficult on the continent".
Parts of France have been plunged into another lockdown and across Europe cases are rising in many countries.
And the PM said putting France on the travel "red list" was "something that we will have to look at", as well as testing hauliers coming in transporting goods.
WHAT THE HOL?
The PM admitted: "If it's necessary to bring in testing then we will do so, but I think you should understand the balance of doing that, the disruption to trade, and the risk that we are trying to address."
In response to questioning from Labour's Yvette Cooper he said: "We will take a decision, no matter how tough, to interrupt that trade, to interrupt those flows, if we think that it is necessary to protect public health and to stop new variants coming in.
"It may be that we have to do that very soon."
But he warned yesterday that "putting France on the red list" would have "consequences" for UK supplies.
Anyone coming back from countries which are on the "red list" has to quarantine for 10 days and stay in a quarantine hotel at the moment.
But that list can be expanded at any time, ministers have warned.
There are huge fines for failing to quarantine or take tests.
Crisis talks ended with both sides vowing to work together on a “win-win situation” after days of EU mayhem-making.
Jonathan Van-Tam is reported to have told MPs that 68 per cent of French arrivals — mostly lorry drivers – do not have to self-isolate, which may be driving infections.
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People already face £200 fines for not filling out the correct paperwork too.
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The new laws will come in on Monday - though travel is already illegal in the current lockdown.
Brits won't be allowed to go abroad until May 17 under Boris' roadmap, but ministers have yet to make any final decisions.