Ann and Jon
During the summer you should be able to get a direct flight from Liverpool or Manchester airport to Bezier or Montpellier airports ( I flew out of Leeds). Bezier is close to Cap d'Agde but is small and only open in the height of summer. It has fewer flights. Montpellier is a full size airport but further from the Cap. We hired a car (get good prices through the airline) which made the transfer easy. But we had no use for the car whilst there. You may find that you're accommodation provider does an airport pick-up. Otherwise it's a train or bus ride or an expensive taxi..
Thank you. Do you know of any good self-catering hotels there. Jon
As far as I know neither of the hotels are self catering. There are literally thousands of apartments you can hire for your stay. They vary in size down to studio apartments. They are self catering. And there are plenty of eating places for when you don't want to cook.