Can I get spare part to fix?

I purchased PRO 1200 Compound Mitre Saw-210mm[CLM210LMS] about a year n half ago from Homebase -The gear that drives the saw has stripped and consequently the saw doesn't turn - it would seem this is a possible fault especially as I only use the machine now and again for light work?? Can I purchase or obtain from you the part and how do I describe the part properly to you?