My Clio 172 mk2 (2003) was experiencing a grinding / nocking noise when accelerating hard in 1st and sometimes in 2nd. I took it to Reg Vardys (local reno dealer) who have fixed it by adjusting / replacing the gearbox mounts (I think thats what they did ). I just thought I would post this in case some 1 else has the same issues it might point them in the right direction!