Real Issue Here
Strikes me the real issue here is his actions, not really where the cameras were etc. Even the ICO official advice (as posted elsewhere) says it's OK for your camera to cover public or other peoples private areas, provided it's not excessive and you've done your best to minimise it and ensure nothing particularly sensitive (such as looking through a window) is included. They then say you'll obviously need to obey the DPA, including things like SARs and taking adequate security measures etc.
What's really the issue here is the way he reacted, tried to mislead the doctor etc.etc. Plus, he didn't act reasonably beforehand. If he'd spoken with everyone using that shared parking area and explained what he was going to do (put a camera on it all) and they all had no objection, can't see him being in the situation now. Normal neighbourly behaviour you would hope. From the layout shown in the media, can't really see how his camera covered her back garden (except through overshoot maybe and not pointing it downwards enough) and his ring doorbell certainly doesn't look to cover her property.
Maybe he should have spoken with them all, explained what he wanted to do, got their agreement (or not) and then when he'd done it, shown each of them the footage etc. Then, if she had an objection to one of the cameras seeing unduly into her garden, he could have adjusted it. Being a good and reasonable neighbour would seem to avoid most of these things.