Thanks YG and others, some great advice here. I wish this sort of information could be put "out there" more - even included in all the stuff you get given when you get pregnant. It would help so many people if in between all the information about pregnancy, labour etc there were a few pages on how to make sure your family (whether partners or children) are provided for if anything bad happens - wills, marriage, benefits and how to get advice... Of course it's not only needed for people with kids, but that would be one good opportunity to get the information out and parents probably need it more than anyone.
Wonder if MN could put some of this info on their homepage too, either permanently or at least as tip of the day? - not sure how to suggest that?