Despite the rule change, the operator – which represents Costsaver, Trafalgar, Insight Vacations and Luxury Gold –  will still "highly recommend" guests are fully vaccinated against the virus with a booster jab.

Guests have been advised they will still need to comply with specific vaccine and booster requirements imposed by airlines or authorities in the destination visited.

They will also need to abide by requirements for accessing restaurants and venues, which TTC advised may be more restrictive than rules imposed by carriers and destinations.

A spokesperson for the company said: "It is guests’ responsibility to ensure that they comply at all times with these requirements. No refunds will be given if guests are unable to undertake some or all of their holiday due to their failure to comply with these requirements.

"The changes do not come into place until January 2023 and anyone wishing to travel for the remainder of 2022 must still adhere to current terms and conditions."