Rewired the mosfet in and put it all back together. IT'S ALIVE!
Tooks me a few hours this evening. As someone previsouly said, the wires that came with the mosfet are huge. So big that the first time wiring it up and trying it the motor cut through the wire. I had to strip it all down again and got some 0.75mm red and black wire from work. The wiring job is appauling to be honest, not my proudest work i've done. I found it really fiddly and had to reuse the original motor clips as the ones with the mosfet broke (probably my fault).
Anyway, I'll have to try some round through it tomorrow when I'm home. Not too sure if I've gained any ROF yet (Changed the gears, bushes for bearings and shimmed it while it was open) but atleast it's ready for 11.1V lipo and a lonex A1 motor.