I was all set to get on with some painting last night when my PNKD flared up. Its kind of hard to paint when you can't move your right arm properly so that was that.
I did manage to nip out to B&Q to try and find something to base the Aliens and Marines on. I found some washers of about the right size but they are more expensive than the miniatures themselves! I think I'll follow a suggestion from TMP and see if I can find a suitable hole punch at a craft store instead.