You can get the slides and ready-to-run example code (including saved copies of the expected output) from here.

It was really good fun, actually, giving the preso. - and it seemed to go fairly well. The feedback has all been very positive so far too, which is ace.
You can view the recording if you missed it at http://experts.na3.acrobat.com/p79554026/.

Thanks to all those who came and to Charlie for giving me the chance to do it.