Ok dont worry anymore guys. I looked at the other one's post and did some tweaking, and got it to work.
For anyone interested -
I took my fan and cut the red and black wire from the 4 pin molex connector, i then stripped the ends of to reveal bare wire.
I then got an old 3 pin connector plastic body.
Inserted the black and red wire and then hooked it up to my colle rmaster fan contoller - turned on my PC and nothing happened.
I jiggled the wires about and the fan started to power up.
Holding the wires in this position i turned the fan up to full speed and it worked - success!
So all i need to do now is tape the wires in the right place and im done - thanks for your help