Just got an email from RCS in London, they said this
"If the person you are researching was a member of this college we should find his name in our records, but not much more than that as we only hold more detailed information on those who were fellows of the college. It is particularly difficult when researching early surgeons as we are rather limited in the sources available to us (the Medical Directory does not begin publishing until 1845 and the Medical Register 1859)."
They can check for his name I suppose for a charge of £12 do you think it would be worthwhile doing that?