Thanks to all for the comments. It is at least a tiny but notable bit of model steam trivia.
Also makes me wonder if there were ever any TV ads for model steam engines?? If such ads ever existed, I would guess that they probably came from one or more of the "big three" - Jensen, Mamod. or Wilesco. And at Christmas time, and probably from the 1960s. But it seems unlikely that such a thing would have ever occurred, as the overall market base for model steam engines was probably never large enough to support something as costly as TV advertising!