The talk was given by Kevin Payne, who has a background as an engineer with British Rail but has worked in various areas for TfL since 1989, and was appointed Director of the 'Cooling the Tube' programme 12 months ago. The room had about 150 (!) people in it, mostly engineering folk and some architects [I had a glass of wine and chatted to some folk from Arup afterwards - "A blog? What's that?" they said ]
Kevin started by talking about the history of the problem, outlining current cooling methods and then looking at what might be done in future.
I've not had the opportunity to read both of their notes in full yet, but look fascinating and it's great that the plans for the future have been shared like this.