Well, I spent yesterday evening applying transfers to the coaches and giving the roofs and the Minitrix bash a waft of primer.
The class numbers on the doors are LNER loco numbers but unfortunately I'm short of 2 3rds for the other side of the non brake. Another sheet on order. They are a perfect match for the Talyllyn fleet numbers. One slight concern is that I seem to have made them look rather like 1980s FR coaches... a livery which I loathed. Hmm.
Anyway, I can paint the Minitrix now and give the roofs a coat of dirty black. Really must get a bit further with the main layout, I'm looking forward to playing trains again.