This, if you find it, is a brief review of my experiences which may, at least, help you avoid the pits that I fell into.
Fly.co.uk add, without making it obvious enough for me to have noticed, a service fee to your bill. Mine was more than 20% of the cost of the flight
Fly.co.uk also charge a fee for using a credit card - 7.5% for Mastercard - which seems unlikely to be the actual cost that they have to pay themselves
I was sure that I had deleted their travel insurance, but it resurfaced on my bill
Well, in my defence, this was after a good party and I was not being as careful as I might.
When, if, you get to the point of complaining or asking for help, they do not answer emails, and offer only a vastly expensive premium rate number.
All in all, however high Fly.co.uk are in the Google rankings, I'll never be using them again