Thanks Malone.
I still think I'm missing some of the extra letters. can you confirm (or not) that they extra are...
1a BB - 6a AA - 12a C - 26a O - 8d AA - 13a R?
The problem is that for the unknown in column 2 I've used an O (hypo....) but in the unknown in row 10 I've also used an O and an I (goit....) but I can't see where the I comes from and it means using the O twice. Also, where is the R in 13a used?