This is due to a website malfunction, in the worst digi-gremlin attack we've yet seen. Ok, so we weren't actually attacked by gremlins, but whilst tinkering with a few bits and pieces we seem to have managed to remove all the books from our website. Which with 2000 titles knocking about is pretty impressive. The books are back up after a quick fix (phew) but it will take a while for our puffing and panting ecommerce system to catch up with us. You should see books become available to buy again over the next 12 hours or so.
Please bear with us while we resolve the problem.
Thank you for your patience!