Have managed to book a week in Calis Beach for 2 adults and 2 children for £730 which includes flights, 3 bedroom apartment and private return transfer from the airport.

Flights from Gatwick £119 each plus the 1% charge for using a debit card

= £480.76
3 bed apart £200.00
Private minibus transfer £50.00

Flights were booked via http://www.cheapestflights.co.uk and the apartments are http://www.tenapartments.com

I hope this helps someone looking to do DIY. We felt this was a great price, we have the flights and apartments that we wanted. Unfortunately not many tour operators go to Calis any more.