Thanks all.

Ive been meaning to come back and respond.
Im definitely starting to think it has a lot to do with the end of year and been tired.
DD1 and I have had a few talks about school and whats going on and what triggers her tantrums. Ive asked her to come and talk to me about anything/everything, when she needs and that seems to be making a big difference. I just have to remind her daily that I am here and happy to listen.

I also worked out she was having a rough time at school with some of her 'friends' not being so nice to her. Se we've had a chat, and talked about how to handle that, and her mood seems to be changing.

With the hitting and screaming she's starting to work out that violence doesn't pay, every time any of them do it, they are removed from the situation and when they are calm we talk about it. Nothing new in this, but I must be starting to make headway with it.
Thank you all for responding