Colin Tyler's son Neil is in the process of setting up business to once agin produce the models that his father and John Haining designed.
There will be the 2" BB1, 6 Furrow Plough, Derby Digger and the Kitson & Hewitson slant shaft ploughing engine
I think he's an occasional member here but has recently been posting on Model Engineers site so you could contact him via there.
http://www.model-engineer.co.uk/foru...s.asp?th=40512
Up until recently Blackgates sold the BB1 drawiongs but I understand they lost/misplaced the originals in a recent move
http://www.blackgates.co.uk/body_dra...ml#Countrymans Steam
There is an agreement between Brunell and Neil so you may also be able to source the that way but probably better going straight to Neil.
You may also want to contact this Guy, hes thinking of doing a 3" or 4" BB1
http://www.tractiontalkforum.com/showthread.php?t=17437
Jason