Unbeknownst to us, (don't publishers tell authors such things?) the book that started all this was released as a Kindle edition back in March!
We've recently had a look at it on both a tablet and an old-style kindle and are very pleased with the electronic edition. It seems very good value at just £6.76, and is easy to use, particularly when viewed on a tablet (the colour plates are zoomable).
Here is a link to the Kindle edition page on Amazon.co.uk