Well don't worry about the price difference, there's no hidden fee @ Multiflight. Only did my MCC there but found it was indeed a good outfit. Head of training is Malcolm Dean, airline Cpt & top guy. The facility was founded by & still belongs to a successful Yorkshire businessman named David Hood, whose fortune is said to exceed £700 million (for the record, he owns 2 Ferraris & has just bought himself a new B737)... so basically he can just name any price he wants for the JAR courses. As a matter of fact, most of Multiflight's income has nothing to do with the flight school itself, but comes from the maintenance facility. So, from my experience, they won't B as interested in getting your money as fast as they can, unlike some big CAP509 facilities...
As for the training itself, I'm sure U'll find lots of other PPRuNers currently on the JAR courses there.
MF