Cheers Dave, I hope you are wrong as Mike has just sent me a TO48 saying it is what is suggested by BSA...typo I guess/hope, otherwise it sounds exactly like what I have ordered.
Actually, the little beast is surprisingly accurate even without a rear sight...ok, its only 6 yards but still a single hole with some crappy old wasps.
Pity the stock is a bit beaten, but not a wreck