Oh Ken that's rubbish. I bet you have so been looking forward to having your own space back, and moreso with your wife expecting.
If firm words aren't working, perhaps a letter that you keep a copy of? Also, you could start a diary of the disturbances as of NOW, and get in touch with the Council if he doesn't get the message in the next few days. Some people are just damn disrespectful. I think I would want to lamp him too, but unfortunately it's not very conducive to a solution! :S
Environmental Health will ask you to keep a noise diary anyway, so you may as well start early! It gives you a little backup too.
I have lived with noise and disturbance at stupid hours ever since I left home, so I am pretty used to it!
Good luck, and congratulations to you both on your impending arrival! x