Sorry, that message left before I was finished. I have a suspicion that this is the delivery wagon built by Carl Amsley in the early '60s, although repainted a rather startling blue. A photo of the original is attached to the previous post.
Can anyone confirm whether or not this is the car at the Castle? Also, I ran into another scrap of information about 2 Stanleys being built at the Castle, some years back. Does anyone know if they were ever finished?