Slightly embarrassing problem, I was changing my controls and hit escape without realising I had inadvertently removed a key to menu.
So basically my menu button is unassinged and I have no way of assigning it as you have to be playing to get the menu up and obviously I can no longer do that LMAO.
There is a txt file in the steam folder that contains a file called "ControlMap_Custom" I loaded this but it was in binary but he told me to delete it and BINGO everything is good again.