Thanks again for all the advice. Today he has been the model child. we went to the Justine Clark concert, and he was so good. he went to bed fairly well too, without ironman, as he threw him when I told him not to earlier. he as a bit upset that I was standing my ground and not giving him back, but he understands, as he said to me that he can't have him because he was naughty.

Instead of naughty corner, I am going to put him on the other side of the baby gate, until he behaves. Meaning that he can still see me, but has no where to go except the hallway, as I will close all the other doors, and he can't reach the handles. An empty hallway might start making him realise that being naughty is not fun.
I do think some of it is attention seeking. I am spending time with the baby, so he doesn't have my undivided attention