Narrow gauge railway stamps

The ebook edition (both Kindle and epub) is now out and available, at least in the UK, from both the publishers and Amazon and Kobo. I have just read it. Philatelically there is no great depth, but the illustrations are good and there is information about the railways to which the stamps shown relate. You need to read the book on a device capable of showing colour pictures. My iPad was perfect, using the free Kobo app.