A couple of people already know about this (I went into panic mode) but I'll thought I better post up anyway.
For the past couple of days I have noticed a 'ticking' noise coming from the n/s front area. I thought it was the cv joint playing up a bit , well last night I was changing from 2nd to 3rd and the engine just revved it's nuts off and there was a very loud metallic clanking noise. Managed to pull over quite quickly and my first thought was the cv joint had popped out.
After sitting there and thinking for a while I done the obvious checks and could not find anything visually wrong. When I started the car back up it sounded fine for about 10 seconds but then it made the metallic noise again. Tried the gearbox and I could get 1st, 2nd and reverse but nothing else.
Managed to get towed home and now that's it!!
I'm assuming that it is definatly the gearbox, so the quest for an F20 begins!