Lee, can I just point out on the flip side of that there's lots of people complain that they *don't* get information from local candidates during the election. Unfortunately people's allegiances do change and they're fairly fickle when it comes to their politics but I agree with your sentiment.
As for getting information despite being on the edited electoral register, councils and political parties have access to the full register. The reason being is that's why it exists in the first place. Its for electoral purposes.
I've never understood why people get so upset about getting leaflets from political parties. If you don't want to vote for them or vote at all even then chuck it in the recycling. As it happens, if you don't want any bother at all then just tell your next local canvasser that you don't want further information, they update their information because believe me they don't want to waste the effort of sending you political literature you don't care about either.
All I would say about that is, like social media or the news sites you choose to visit, you end up living in a bubble where you only hear or see things you agree with and never have your opinion challenged. Which is a scary prospect.