I guess some letters must be incorrect, but 2 down has really bogged me down. Any assistance, please - as always gratefully received:-
2 down Once in a vacuum, Tim sadly doesn't say very much. (15 letters) U-C-R-U-I-A---
Also, 14 down, please, Subject not popular in revolutionary Cuban ministry. (9 letters) --E-I---Y
And finally 1 down, Prodigal treasurer in Wales suffering breakdown (7 lettersd) W-S-M-L.