Thankfully in the UK there are quite a few small schools who are run by instructors who don't cut corners and give a way better service than larger schools.
The majority don't care where you train, there are some that won't touch you with a barge pole from certain schools and there are others (only 1 or 2) if they were hiring they would only take from one source.
Quite alot of the time taking from 1 school is nothing to do with the quality of the output, its purely a way of cutting down the adminsrative overhead of having 1000's of CV's turn up and having to filter out all the window lickers and no hopers. Ask a school to send over twice the number that are required, that they would recommend couple of days of interviews couple of days of sim checks and thats the job done.
Folk don't have time to wade through the wannabie army's collective CV's there is littary 1000's of them. Even a small TP company with 5 aircraft gets over a hundred per month and 80% of them are exactly the same apart from a spread of hours of about 30. Another 15% are instructors with over 1000 hours and 4% are guys who have been made redundant and 1% are none JAR license holders who are living on planet zanussi