[Pigmyhippo]

I've booked through holiday extras, booked from a Moneysupermarket search. Paid £84 for the family for 3 weeks, so not the cheapest, but was rated highly.

Policy states.

A2 If your scheduled airline stops trading
Cover for any amounts already paid and unused for your flight if the scheduled airline on which you are booked to travel stops trading before your departure. £1,500

Conditions

 your flight is booked independently of your accommodation and you have not been
offered an alternative/refund from any other agent.
 the scheduled airline is not in administration or, in the USA and Canada, in Chapter 11 at the time of taking out your policy.