Mystery Mini derivative (6)

Mystery Mini derivatives do not get more mysterious than this one. It was advertised simply as a Special in the early 1970's and came with 1100cc BMC engine and SU carb, pop-up head lights, Marigold paint job and was said to be only 41" high. Where? Rainham, Essex, followed by a phone number of five digits only. Who will tell what ever happened to it? I'd love to hear.