I'm booked from Gatwick in May(6th.-24th.) as I posted elsewhere.
Cardiff and Bristol very expensive this year. I found that if I booked a return for an 'odd' number of days, and not two or three weeks on the Thomas Cook website, the flights became a lot cheaper one way, either going out or returning. Mine was £228 return 'all in' for 18 days, meals,baggage,seat choice,taxes, no debit card fee, and on line book-in, out on Monday, back on Friday. Tried other dates and it worked every time.
if you are 'flexible' give it a try!
Martin.