British tour operator Sun4U has collapsed, leaving approximately 1,200 customers stuck abroad.
The firm’s website said it had ceased trading and advised people to contact claim handlers for the Association of British Travel Agents (ABTA).
Most of the company’s stranded customers are said to be in Spain.
ABTA said those with Air Travel Operators’ Licensing (ATOL) packages should be able to continue with their holidays as planned.
Those with travel insurance should contact their insurance provider as well.