Anyway - thanks for all your opinions. There were a lot of very valid points for and against him going.
I ended up telling him he could go if he wanted but to take the car.
Turns out he decided he felt a bit guilty and organised to go to his mates house (responsible mate) to play pool & have pizza.
They only live around the corner.
DH & I
DD 2 years old
& DS due end of July 2013!