I've have most of the grid entries and have the theme and the groupings for the most of the unclued words but am totally stuck on 36A and the last but one unclued down entry. I've also made sense of only a couple of things emerging from the extra letters so I'm sure I have some mistakes here.
I'm now going round in circles so any help could restore me to sanity (hopefully)!! Please could someone put me out of my misery?
36a Cavalier artist in hospital sadly - HALS
H-hospital
sadly- al(a)s - a being the extra letter
Did you mean the unclued entry which intersects with the 3rd letter of 36a?
If so, it goes with the unclued at 15a
Thanks slaney. Whoops. Yes I did mean that one. If it begins with B I now have it as it definitely fits with 15a and gives me the letter I wanted. I had misled myself with my wrong answer at 36a! My grid is complete!
Now to sort out the rest of those extra letters . . .