But I am really surprised at your point 3: as I read your words, any nitwit of a n___y could post a notam declaring a TRA around his place for next Sunday's family bbq - surely such postings must be validated by any kind of authority before being published? Really the UK must be a very different place!
Somebody that knows will probably answer this, but what is annoying is people that post long NOTAMs (running for many months) warning of very occasional events. For example, launches of meteorlogical balloons, where they're launched once or twice a month, but there's a near-permanent NOTAM just acting as noise in a long list of NOTAMs. People really shouldn't be allowed to do that. If it's not significant enough to create a Danger Area, then the NOTAM should give individual dates and times of activity.