I'm sure Gordon Brooks knows the answer, so I will lock this for you.
Thanks for this clue!
As I do not think you are in touch with Gordon, I reasoned that there must be some reference to him and this car on the Internet and so it proved.
Thomas Spencer, joiner and watchmaker, probably built at least two cars sometime around 1900 and this seems to be the second one. Spencer was in Misterton, Nottinghamshire but his car was registered W94, a Sheffield (Yorkshire) registration.
The car seems to have had several different forms of body, including a post van, and four different engines.