Have to agree with what Freckle says. It is really important to get a proper will drawn up by a specialist. That is a solicitor, not a DIY one and not from one of these will writing companies. A solicitor has trained for years to do it right and get the wording just so.
Dh is a private client solictior which means he spends a good deal of his time writing and drafting wills and dealing with probate. Even if you think your will would be straight forward - do see a solicitor. If it is a more complicated situation - go and see one NOW!!! If you don't have a will then when you die what happens may not be what you want to have happened.
So please, all of you go and get an up to date will. It isn't that expensive in the scheme of things, and it is important - especially when you have children to look after if you are not there to do it yourself.