If you visit a specialist CV repair shop as opposed to a regular workshop, they will diagnose it in a flash. If the rubber boot gets damaged, either from wear and tear, or gets cut for some reason and the lubricant runs out, the noise you described follows quickly. Judging from your comments and replies, I am 99% sure this is your problem. CV joints cost around £30 and it is about 45 mins labour to remove and refit it.