Are you familar with Ryanair? They offer a fair number of flights from their "hub" at SNN that I have taken a number of times ranging in cities throughout Western, Central, and Eastern Europe. They don't offer as many destinations as from London by any means, but they still have a pretty good variety for a smaller airport, and the price is usually right: http://www.ryanair.com/site/EN/dests.php?flash=chk