Thanks Guys, I've printed off the transmission fault codes and I'll take them to Adrian (Japan Direct) next week. I noticed that code no.1 was engine speed unit, since the recon pump was fitted I have noticed that the tick over speed seems a bit slow, I wonder if this might have something to do with it?
I would also like to point out that I am totally thick when it comes to anything mechanical on cars, so if I ask stupid questions you'll just have to bear with me
Once again thankyou for your help and I'll let you know what happens.