Hi Julian, thank you so much for your comments.....
I think the article in the RM is December 1971?
I agree with you the NLR is such a fascinating railway company, and its quite amazing what they did at Bow and Devons Road. Ive enjoyed the research very much, and out of my window in Camden I watch in the distance the current North London line (or Overground) trundle by, still with a lot of freight movement.Then to discover a good few generations back my relatives worked on the railway at Camden roundhouse and the stables now the famous market made me smile.. Im summoning the courage to tackle one of the outside cylinder 4-4-0's next if I can work out how to deal with the angles of the cylinders and make a one piece smokebox/cylinder !
best wishes Michael