So, in my previous post about this subject, I was having a problem with my son not answering when spoken to. This was a problem others were reporting too.
I have worked with him on this, gently reminding him every time he forgets, and making him happier in general. We have become closer as a result of this, which is much better than just shouting at him.
His behaviour in this respect is much better, and his behaviour in general is much better. We are still having occasional bits of misbehaviour as you might expect, but they can be dealt with much quicker, and without them escalating into something more serious.