Good luck with your new book Tony, I have both your 21/9 and 28 books could not put the 21/9 down, so much in their we had been trying to research for years, unfortunately I had hardly opened the Metrovick book when my wife took it for an Xmas present for me, any chance of any more books on Baby Deltics, Claytons ect all loco,s I sadly never got to see. Steve ward