Sounds like a child looking for power. Back to my recommendation of the book, Raising Our Children, Raising Ourselves. If you read it, you will learn the REASON behind his behaviors. Only when you know the reason he must do what he does, you can then help him.
Every child does things for a valid reason. We may not understand it, but we must find the reason and alleviate the cause.

We have started sending the kids to bed at different times and making a good 30 mins for both of us to try and talk with thomas, he is responding well to extra 1 on 1 time at home. His behavoiur has leveled out a little especially over the last week, we are trying to be more understanding of his situation and his individual needs. thank you for your advice everyone. x