I think it does matter which school you go to. I'm not saying you need to go to a big well known school that costs alot, but you should look for a school that has a good pass rate and has a history of students that have since found jobs. Allow me to emphasise the word history as no jobs happening at the moment!
What is also very important as far as I'm aware, the airlines like you to have done IR and CPL at same school. Bear that in mind.
I can't speak of other schools as have no experience of them, but I can speak of BCFT in Bournemouth, which is a fairly small school, good price in my opinion, good experienced instrustors and teaching (quite a relaxed atmosphere), and above all generally has a good pass rate (if you discount the numptys that don't put any effort in.)
But work out what's best for you, location, price, etc. Visit the schools as you are gonna spend alot of time and money there, you want to make sure you personally have a good vibe of the place.