Thanks for the reply Mike.
The Z & Y axis stepper motors are a lot smaller than the X axis motor and have 6 wires, where the X has 4, with different wire colours, so it doesn't look like a direct swap. I did disconnect the motor completely from the ballscrew & it was making noises but the spindle was still not moving. I know the forum here is full of enthusiasts who know their machines inside & out, but I use my machine as a tool to quicken up production of parts for my business so I don't mind paying someone to fix it for me, it's just finding someone who can.
I am assuming that the motor is similar to a normal motor so can be tested & fixed - the only replacement units I can find online are in the states & cost $900 - so based on that if the motor can't be fixed then I may just get a X-carve.

Cheers,

Steve