That is a very good question. My source (which is an old, trusted and normally reliable book by a respected author) does state that it 'was the same design as the Aluminium-Français-Gregoire', so, technically, it could be a Kendall, but as you say, it would be natural to assume that a British version would have right hand drive. The licence plate, which I have blanked out, reads 137 RN9 and looks French, and is indeed the same as on the Gregoire that you linked to. So, in this case, it appears that my book is wrong (the author has probably just put up a picture of the Gregoire as it was supposed to look the same). Sloppy!
I've awarded DynaMike a point for correcting my source.