Can I ask why they still list results by gun-time, though? Hardly seems fair with that many people and narrow-ish roads.
Because it's a race. the first one across the line is the winner, not someone who may have started further back and taken a couple of seconds to cross the line. Can you imagine having to tell the winner that he hadn't actually won the race because the person he had just outsprinted had actually run a quicker (chip) time !
... I just think it would have been a good idea for the organisers to have contacted us by e-mail to let us know what was happening in the days beforehand.
I think you are being a bit unrealistic in your expectations there. Given that there were over 1000 entries, that would have involved a massive amount of work by the organisers (typing in all those email addresses, or even just cutting-and-pasting), at the very time when they were pulling out all the stops to ensure that the race went ahead. As you yourself acknowledge, they were putting updates on their website - what extra benefit would be provided by an individual email ?
Whatever your ability, you will be put in a suitable group, so that you will be competing against runners of the same standard as you. If you improve significantly (or slow down), you might be moved up (and down) a group the following year.
For anyone else reading this, membership is just £5 per year, plus, if you are not already a member of an affiliated club, you can pay an extra £5 to affiliate to England Athletics, with NSRRA as your first claim club, and thus save £2 per race entry.