While you might get the script word perfect the effect can still be ruined by stereotypical casting.
There was a radio play based on the Black Buck mission. Now they got John Reeve's voice to a T but some of the other characters were caricatured. Clearly the audience can't 'see' uniforms or necessarily remember all the characters in a short radio play hence the device of using words like 'Engineer' vice Tom, Dick, Harry or Sir, but to then give him a broad Scots accents a la Star Trek ruins it. The nature if the beast is that most RAF officers acquire very similar moderated accents - of course that creates its own problem on radio.