Signed copies should still be available at: The Mysterious Bookshop, New York City   https://www.mysteriousbookshop.com/

The Atlantis Bookshop, London     http://theatlantisbookshop.com/

The Arthur Conan Doyle Centre, Edinburgh     https://www.arthurconandoylecentre.com/

and possibly through Barry Young at Young’s Interesting Books in Glasgow    https://www.yelp.com/biz/youngs-interesting-books-glasgow