Thomas Cook is to hold crisis talks in a final bid to secure a rescue deal.
The meeting with its biggest shareholder and creditors is understood to be scheduled for Sunday morning at City law firm Slaughter & May.
The tour operator could fall into administration within days unless it finds £200m in extra funds.
It comes as holidaymakers staying at a hotel in Tunisia owed money by Thomas Cook were reportedly prevented from leaving the resort until it was paid.
Guests at the Les Orangers beach resort in the town of Hammamet, near Tunis, said the hotel was refusing to let them leave because of concerns about Thomas Cook’s future.
Customers have reported that the hotel is asking visitors to pay extra money amid fears it will not be paid what it is owed by the tour operator for bookings.
‘Being held hostage’
Ryan Farmer, from Leicestershire, told BBC Radio 5 Live the hotel demanded all guests who were due to leave go to reception “to pay additional fees, obviously because of the situation with Thomas Cook”.
Security guards closed the hotel’s gates as guests refused to pay the extra fee, Mr Farmer claims.
He told the Stephen Nolan show: “I’d describe it as exactly the same as being held hostage.”
The government has been urged to step in to bail out the company amid fears its collapse could leave about 150,000 British tourists stranded.
Concerned customers have been reminded on social media that they have Atol protection – a fund paid for through industry levies – “in the event that Thomas Cook goes into administration”.
The travel firm also reassured customers on Saturday night that flights continue to operate as normal.
The Transport Salaried Staffs Association (TSSA) union, which represents staff at the struggling travel company, has called on Business Secretary Andrea Leadsom to save Thomas Cook “no matter what”.
Government sources suggest ministers are reluctant to help the firm.
TSSA general secretary Manuel Cortes told Mrs Leadsom it was up to the government to save thousands of jobs and to allow Thomas Cook to “flourish”.
Shadow business secretary Rebecca Long-Bailey said “all viable options” for saving the travel giant should be explored.
She added that “the government must consider stepping in and taking an equity stake to avoid this crisis”.
BBC business editor Simon Jack reported on Saturday that government sources had questioned the financial wisdom of stepping in to save the company.
He said the government did not see its options as being between spending £200m to help Thomas Cook with its cash shortfall or £600m to repatriate its British customers abroad.
Currently there are 600,000 Thomas Cook customers on holiday, of which 150,000 to 160,000 are British.
One of the world’s largest travel companies, Thomas Cook was founded in 1841 to operate temperance day trips, and now has annual sales of £9bn.
It employs 22,000 staff, 9,000 of whom are in the UK, and serves 19 million customers a year in 16 different countries.
Chloe Hardy from Leicestershire is due to get married in Zante in October and booked the wedding package with Thomas Cook back in June 2018.
Chloe and her fiance will also have 33 family members flying out, with their trips costing more than £33,000 in total.
With the big day looming, Chloe is frustrated by Thomas Cook’s handling of their booking.
“I have emailed the wedding concierge and co-ordinator, neither has got back to me. We are unsure if we will be able to fly. Although it’s Atol-protected I have booked three weeks’ leave from work and there’s no guarantee that I will be able to get time off if I had to rebook.”
“We’ve had constant questions from our family that we are unable to answer,” she added. “This is causing great concern, worry and stress to all of us involved.”
Thomas Cook’s financial difficulties have mounted over the past year, culminating with the agreement in August of a rescue deal led by its biggest shareholder Fosun.
In July, Thomas Cook produced a business plan saying that it needed £900m in refinancing, up from a previous estimate of £150m. The £900m would come from Fosun, the group of creditors and some other investors.
The group of lenders then commissioned an independent investigation. Its financial advisers said Thomas Cook would require an additional £200m on top of the £900m already required, which would bring the total refinancing needed up to £1.1bn.
Thomas Cook succeeded in finding a backer to provide the additional £200m, but the BBC understands it has since pulled out.
The firm has blamed a series of problems for its profit warnings, including political unrest in holiday destinations such as Turkey, last summer’s prolonged heatwave and customers delaying booking holidays because of Brexit.
What are your rights?
If you are on a package holiday you are covered by the Air Travel Organiser’s Licence scheme (Atol).
The scheme will pay for your accommodation abroad, although you may have to move to a different hotel or apartment.
Atol will also pay to have you brought home if the airline is no longer operating.
If you have holiday booked in the future you will also be refunded by the scheme.
If you have booked a flight-only deal you will need to apply to your travel insurance company or credit card and debit card provider to seek a refund.
When Monarch Airlines collapsed in 2017, the government organised to bring home all the stranded passengers, whether they were covered by Atol or not.
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