I learnt at Old Buckenham and they run a scheme where you can put £1k into your account and they give 10% discount,some students did it that way,I paid as I went,usually settling up at the end of the weekend once they got to know me.
I would be very wary of paying up front for the whole course, maybe I am wrong because it works for some,but once youv'e lost your dosh it's a bit too late to be sorry!
As already mentioned, if it's a well established school that has been running the scheme for a while,it could be OK.
Lister