I though the VII was a giveaway as my mare has this suffix. He is included in the non thougherbred register with weatherbys. However both his parents are unregistered (hence the vII) and he was born in 1988. He may be registered with another breed society were you will get more information. However there appears to be a few offspring of his registered weatherbys.
Well if you open the link it will take you through to the stud. Their son has started competiting him again. We had a son of his at they yard which you could tell straight away was a Dextre offspring.