The more I look into it, the less keen I am on the blasting options. The risk of damage to the metal seems to be high, and the last thing I want is to have to be using high-build primer or filler to rectify warped panelwork.
However, I've just got off the phone from a very interesting chat with 'Paint Strip' in Preston, and now I am 99% certain I will use their services. They were the people who did Chris Astley's shell some years ago.
Their thermal paint removal process is going to cost me less than £450 (could be a fair bit less than that due to the lack of rust and absence of any external panels on my car), and they can primer the whole car, and powder coat the inside in a colour of my choice for roughly £200 more.