The diagram 67 and 191 horseboxes were actually NER stock, Dans numbers DS170 and DS177 refer.
The LNER horseboxes were DS312 for the for the Dia 5 and DS314 for the Dia 4, these being some of the last models Danny did for 4mm.
I have been informed by a member of the GCR Society that some of the GCR stock (etched products anyway) are to be taken over by the Society for production.