I made one up, however there were Prototype examples. It's just I've not got any Pics to help.
BR SR WOEML early 60s, West of Salisbury and East of Exeter. Racehorses and Staff. A Rake of Mk1 Horse Boxes (Flexible number) I got most of at Auction at a VERY good Price...including TMC Weathered versions and a couple of Bulleids (BSK and SO usually).
That could probably be adapted to Cavalry, just for fun.
Phil