Bealzebub is right that there is currently a trend to take pilots from a certain flight school background in many airlines. Nearly all european legacy carriers run their own cadet schemes as well for exactly the same reasons, many of them at least partly sponsored. If they have to take direct entry pilots they do a very thorough assessment, one of the steps in that is of course what kind of training the applicant has received which will of course play a pretty big part in the decision if they invite that applicant for further testing.
However this easyjet thing is, especially in terms of financial risk , not a good investment. Check out the other cadet programs in europe or worldwide, learn a second language if you haven't already (secondary and tertiary language knowledge is required in most of europe to get your A levels) and apply elsewhere.