The "new" David & Charles was taken over by Readers Digest ..The railway titles I cannot remember where they went..I feel the rights to most of the railway titles remained with David St John Thomas ..He moved to Nairn in Scotland after sale of D&C and lived there till his death about 5 years ago...Died in fact on a cruise in the Baltic Sea.
Back to the books..He remained a publisher in particular of rail books...Unable to quote which ones.
Trouble with him,was his publishing was in large part tied to Book Club sales...Too many of mid range pot boilers..Remember the SR/LNER 150's etc?.Market place was absolutely flooded.Still can buy them at a £1 a book in mint condition.