I wouldn't worry one iota.

Yes I think I do certainly when it comes to driving. Fine with my ability and avoiding any serious happening like a crash, it's more to do with worrying doing something fine worthy. As I'm a new driver, I get paranoid as you can only afford six penalty points in your first two years. I think after this point I will relax a bit more.

I'm probably under the speed limit most of the time but occasionally things like the above get me worried.

As I said I don't really see these red light traffic cameras in London, certainly where I am. Where are most of them?

That hasn't happened me over traffic lights, but I don't know with the restrictions in general, if you go over what they consider a border as in if any part of your vehicle does, you can be in contravention, but this is normally more the case with PCNs