They won't bother with this even if you're caught, which would generally only be if you didn't see everyone slow down for the giant bright yellow box anyway.
Don't do this but don't worry about it either, traffic light cameras are rare. Every day I see maybe three cars sneak through a just-turned-red light when they should stop and I'm pretty sure none of them ever face consequences.
Not that bad an idea if they were almost not legal tbh, don't want to be driving on crappy tyres.
Again, if there are cameras, there are signs indicating this fact all over the place. If there aren't, don't lose any sleep over it.
I'm not really sure what to say to this, other than it really doesn't sound like you're very likely to get points, and if you do it's really not the end of the world.