Wizzair are more comparable with Ryanair than Easy- my guess is they have nothing like the "book late pay a premium" business traffic which EasyJet does. The latter will be reluctant to get into a market which doesn't have that traffic. UK sun routes are a bunfight that everyone goes for but with Jet2, Monarch, Ryanair EasyJet Monarch, TUI, Thomas Cook, etc etc in there that's probably too competitive and costly to set up for Wizz. Ryanair have of course gone for Eastern Europe to some extent.