All solved, except 20d and 38a. None of the words which I can find which fit seem to have any connection to the middle part of 40a (as 8d does). Most vexing.
Many thanks, Ironie. My edition of Chambers (the one before the 2012 edition), does not give either of these words as a type of cat. I usually find Doc's puzzles are much more straightforward than those of, say, Mr Magoo or Lavatch, but I think it is a tad unfair if one has to refer to a copy of Bradford's to verify the solution.