Thanks for all the likes.
Looking at the model compared with the photos of the Dornoch branch brake and the Fraserburgh branch brake I don't think they match. Now I don't think that these brake vans were Toad B vans. Counting cladding boards I think there are too many on my model. And the position of the axles relative to the body doesn't look quite right. I think these vans had short bodies, the same as used on the BR standard / Toad D vans, so 16' 6" long instead of 19' on the Toad B and Toad E. I also think the wheelbase might be 10' instead of 10" 6". Too late to change this one now, I should have done the research properly to start with. I suppose I now need to find a Toad B which has the features I have modelled to at least be able to put a correct number on it.

Slaters BR Standard van body on top of the modified Parkside Toad E kit showing the difference in body length.
Very annoying. While writing this post I have just found that I have the diagram for these branch line brake vans and could have got it right to start with. The diagram appears in North Eastern Railway Diagrams of Wagons Volume 2, facsimile published by NERA in 1995. The vans are North Eastern Railway Diagram V.4 10 ton Goods Brake Vans with steel under frame to drawing No. 1313Y, built in April 1908. They were 17' over headstocks with a 10' wheelbase and originally had 3'7" wheels. Not sure if they had smaller wheels by Nationalisation.
Now do I buy another kit or just scratch build a NER Diagram V.4 van?