It's very strange thinking about what happened, nothing went bang or pop or any indication something was wrong with the car. At first I though a belt had snapped. No smoke or burning clutch fluid smell. It was just holding revs one second and then down to almost idle. My gut feeling is that it's either the selector fork or the slave cylinder. Allstar Garage is just up the road from my place, so on Monday I'll go in and speak to them. Shit start to the new year for me.
Thanks for the advice guys,