Dear all,
Thanks
 to several of you who contributed their slides to me, which I've 
re-used to form this version. As the presentation was becoming quite 
long, I've simplified some of the material, so I hope you don't mind.
I
 appreciate that there are likely to be several typos, so if you have 
time to review it that would be great. I also need to spend a little 
more time on editorial touches, such as consistent fonts and date / page
 numbers in the footers etc.
Kind regards
Stephen