Well i brought a bendable telescopic magnet and went fishing but it was impossible.
I rang around local garages including transmission specialists, explained the situation about my stupidity, and am looking at atleast £300 to have the transmission taken off, stripped down and back on. Plus a long wait, all the local garages seem to be busy for weeks.
So i decided bugger it, a reconditioned gearbox from Pumaspeed is around £300 plus the fitting, and decided to refill the gearbox oil and go for a good drive. So far no issues.
What im hoping is that it is stuck to the large magnet at the bottom of the transmission. It's right underneath the fill hole so HOPEFULLY it's on top of it! A mate of mine has put me in contact with a mechanic he knows and I'll see what he can do