This may be a daft question.
I started flying recently, in 2000. Back then, there were no internet-based notam services
AFAIK. The flying school had a thick printout of notams pinned to a notice board, which one was supposed to wade through and check every item on every page for relevance. As a result, almost nobody ever looked at it. I never did, for sure. An instructor occassionally did before sending a student off on a solo navex.
Now, one can get notams over the internet (most schools and most airfields still don't have internet facilities freely available, or available at all, but that's another subject) so suddenly lots more people are aware of the subject.
What has really changed though? Did more people bust airshow areas in the past?
These fast jet exercise areas cover vast areas of Class G and I can't help thinking that they are of little practical relevance as a result. They may as well notam the whole of the UK because fast jets can fly anywhere.
A Q for Aussie Andy: how did you plot those areas? It looks like you typed the coordinates into something like Navbox and created a dummy flight plan with them. I know there are websites which offer pictorial representation but one reads a lot of complaints that they cannot always get the required data feed.