Oh dear.. Gearbox disaster

The track day was great fun, but we only managed to get out onto the track a couple of times before some odd rattling / clanking noises from the rear made us decide to stop. It had been making a few funny noises since we bought it, and these noises got worse as the day progressed so we retired after lunch. I didn't even drive it hard, so it must have had something wrong with it originally that the driving antagonised. We drove around in the afternoon OK other than some dodgy noises coming from the rear, but when we started it the next morning the rear wheels had completely seized up unless you dipped the clutch. We phoned the AA and got them to transport us back to London the next day :(