I'm really stuck on the last few clues which all overlap. Any help would be gratefully received.
Unimpressive, so the postcard shan't be sent? [7,2,5,4,5]: -O-H-N- -O ---T- H-M- ---U- I'm guessing that the 1st word could be NOTHING and the 4th word could be HOME.
20a Wrongly had war concerning computing equipment [8]: N-----R-
19a Get a repeated tune if within radio frequency [4]: ---F
Many thanks.