Not updated it for a while, but added a couple (ok, well one more item - The Oil Cooler) to the list!
http://www.daz-uk.com/williams/differences/http://www.daz-uk.com/williams/differences/
I think as soon as I think of a difference (between either the Williams or the 16v) Ill try and update it straight away. I know there is another difference between the 16v and Williams, but cant think of it at the moment..