go out somewhere..anywhere, cinema whatever and don't leave a note - then go out for tea with bradley and refuse to answer your mobile...
Don't come home till v late...
Alternatively ring him up and tell him exactly what you've said on here - that he's selfish, disrepectful and you won't tolerate him. Give him a set time to get home in (make it realistic) and tell him that if he's not back by then his bags are packed and on the doorstep as you have enough children to look after and don't need one more.
Then print a big notice saying "my selfish husband prefers fishing to preparing for our babies arrival tomorrow..these are his belongings, feel free to take whatever you want" and stick it on the bags.
Even if you don't do any of it - thinking about it will make you smile