Hi Sam,
I know him quite well, but probably not quite as well as my wife does. (Yes, I am he!)
I do not have any spares unfortunately, as they were ridiculously expensive compared to the cost of the book itself. I could let you have the cover off my working copy if it is of interest, as it is of no real use to me. It is in pretty good condition no tears, but a bit frayed on spine edges, front perfect, back a bit scuffed. You can have it for the postage cost.