On Saturday (18 December), France’s stringent new curbs on UK travellers came into force, effectively barring entry without "compelling reason".

Hotelplan brands Inghams and Esprit Ski have already suspended all French ski departures until 4 January, while Club Med has halted all France trips until 2 January.

Crystal has followed suit, cancelling holidays to France departing on 21 December, 28 December and 4 January.

"We understand the huge disappointment this will cause," said Tui-owned Crystal in a statement. "We know customers have been looking forward to their trip to the mountains with friends and family and we’ve emailed all customers with a rebooking incentive.

"For customers that have already purchased their testing packages, please contact your supplier directly to make any changes."

Crystal said it would continue to monitor the situation with regards to departures beyond 4 January. Any customers due to travel between 3 January and 31 January can change their holidays up to 14 days prior to departure.

Those due to travel from 1 February onwards can make changes up to 28 days prior to departure.

France’s ban on British leisure travellers has also hit Crystal’s Andorra and Swizerland programmes.

It said it was working on plans to fly customers who are due to travel to Andorra via France on 19 December, 26 December and 2 January via Barcelona instead "so holidays can continue as planned".

Meanwhile, customers due to travel to Switzerland on 21 December, 28 December and 4 January with Crystal using Tui Airways flights will be moved onto flights with an alternative airline.

"We’ll continue to monitor the situation for future departures and will be in contact with customers directly if there are any changes to flying arrangements," said Crystal with regards to trips to Andorra and Switzerland.