Update on my son who is four and we have been trying a new way to chastise....

Well so far its working fantasticly he really likes going out in the garden I would think you just need to find 'the' thing that works for your child. We remove it for one sleep (one night) and it is working.

He has stopped the screaming as he realises we dont mind him screaming and he isnt going to get his own way so thats brilliant news for us !