As I said, I think I got lucky.
The fact that they didn’t receive any objections was obviously a big plus.
I think it also depends upon where you are and which planning department you have to deal with.
The best advice that I can give to anyone contemplating this is to do your homework:-
Look for previous applications in the area (both successful and failed) and look at the issues that came up.
Be a reasonable about what you ask for. You’re not going to get a 40m commercial lattice radio mast in a small 3 bedroom mid-terrace like where I live.
Make sure you have an answer to everything that you are likely to be asked. For example, I expected the RF issue to come up (as is often the concern with mobile phone masts) so I had the case study of a commercial broadcast mast which had already been approved.
When I gave her around 100 pages of paperwork to read, including some extremely in depth mathematics which had been compiled by experts (who know far more than I ever will) and lawyers, she decided that she wasn’t going to have the time to read & understand it!!!
Like most people, the planners are answerable to a manager. Most of the time they are just covering themselves against any comeback if there’s any problems or repercussions. They’re no different to any of us. They don’t want their boss to shout at them for making a mistake (or a bad decision).
I got the impression that she really liked it when I gave a perfectly valid reason why it was outside of her departments remit (takes the responsibility off of her shoulders).
Remember that they don’t understand amateur radio (unless they happen to be an amateur themselves). Be patient and be prepared to explain what may seem to you to be the blindingly obvious.
Like I said, a little little luck comes into it, but you may be surprised what you can get approved.