Thanks to everyone who has bought the book, or even thought about it. It means a lot. Just picking up a few points...
I suspect there will be a Kindle version, but I don't think it's imminent. All that's controlled by the publisher and I suspect they'll want to shift physical copies first.
Financially, it doesn't make any difference to me where you buy it from, I basically get a very small amount for every copy sold.
Amazon will be cheapest, but they squeeze the publisher by forcing them to sell it at a lower price... and then there's all that 'not paying tax' stuff associated with them. The revenue split for Kindle books is pretty rubbish for the publisher as well.
Bookshop.org stock it - they fulfil orders through independent bookshops, so although it's a bit pricier, it's good to support those people if you can.
Waterstones will have it in Oxford, Witney, Banbury and Didcot and it's available from them online. I'm still to find out whether the club will stock it, I'm hoping so.