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Here you are - this in Thompson's small print:
12. If You Cancel Your Booking
If you want to cancel your booking, or part of it, you must contact us as soon as possible. If you have made your booking through a Travel Agency, your agent must advise us of your request to cancel. Once your booking has been cancelled you can expect to receive a cancellation invoice within 14 days. If you don’t please contact us.
To cover the cost of processing your cancellation, and to compensate us for the risk that we may not be able to resell your travel arrangements, we’ll make a cancellation charge on the scale shown below. You are responsible for paying this charge.
Guide To Our Cancellation Charges
These charges are based on how many days before your booked departure we receive your cancellation notice, and are a percentage of the total cost of your booking, not including your insurance premium. If you want to cancel one or more passengers on the booking you’ll have to pay a proportion of the applicable cancellation charge for those passengers.
Period Before Departure When Notice Of Cancellation Is Received Percentage Of Total Booking Price
70 days or more Loss of deposit
69 - 63 days 30%
62 - 49 days 50%
48 - 29 days 70%
28 - 15 days 90%
14 - 0 days 100%
Your deposit is non-refundable, even if the cancellation charge calculated is lower than the deposit amount paid. Where extra facilities or transport options, see Sections 10 and 11.4, are non-refundable, in part or in full, the cost of these will be added to the cancellation charge you have to pay.
If you booked using a Low Deposit Offer, the full deposit amount stated on your confirmation invoice will need to be paid upon cancellation.
The cancellation charge may be higher for certain travel arrangements, such as coach tours or scheduled airfares. Please ask for details of cancellation charges when you book and check your insurance policy to see if you’d be covered for the cost of any cancellation charges.
So if you booked with Thompson then the holiday is more than 70 days away so you lose your deposit, but as you paid on a Low Deposit Offer (see in bold) then you will have to pay the full deposit you would have made had you not paid on the offer