In reply to GridNorth:
Ryanair fly to Kos (from Stansted) from 1st April, Easyjet start 30th April (from Gatwick).
Going via Athens isn't necessarily a hassle - the onward flights are with Aegean - if the times are right. You can actually choose to fly into Kalymnos too! In March we are flying Manchester > Athens > Kos with Aegean all the way. Very civilised times and reasonable prices - £120 each.
Chris