Obviously the best way is to turn up at a signing, however…
For those that can't, for reasons geographical or otherwise, I now have a solution, as promised.
Byron Godfrey, who runs the independent bookshop in Garforth where I live, is able to provide signed copies on request, on the basis that I can pop down and sign some for him as and when necessary. You could therefore do worse than contacting him on:
He will happily post to international readers.
It's also worth noting that Forbidden Planet in London has books in stock and may be able to mail signed copies out — their website is here
(1) Replace the (at) and the (dots), obviously, but this way I'm hopefully protecting him from being spammed by bots or botted by spam or however it works.