>Skyscanner.net is pretty good.
Thanks for the link julietnovemberpapa. I found it useful.
It appears as if Ryanair and Easyjet are taking certain Dutch and German webscraping websites to court ATM.
Look here:-
Is Screenscraping Legal? Ryanair Versus Bravofly
IMO this will be to their detriment. Most websites welcome scraping if it generates business for them. If only they would improve their own sites regarding flight availability/pricing, then webscrapers wouldn't be necessary?