A rather easy grid-fill, apart from 14ac and 38ac. However, as so often, this is where things get tricky. My immediate worry is that there must be more than 31 omitted letters ( at least one from each of 31 clues) so why does it then refer to the 28 omitted letters?
Can anyone give a nudge for wordplay on 33dn? I have all the crossing entries and a plausible entry for the definition, but the wp is giving me nothing. Just a nudge.
giving the full answers away here is a slap in the face not only for the setter but for anyone else who bothers to make the effort to work it out for themselves