I've just had a chance to glance @ the book before I came to work again tonight. It is a Norton, but not a 16H. It is in fact an ES2, which is interesting, because this model was never supplied to the army, so it must be an "impressed" civilian vehicle; from the aplomb with which he is riding it, it may even have been his own, it was not unknown for riders to volunteer their services complete with mount! Even by 1941, the Home Forces were still using a lot of ex-civilian vehicles, the purpose built replacements for the equipment lost at Dunkirk normally went overseas to the Middle East for the Desesrt War. The guardsman featured is lucky in his mount, as the ES2 was considered quite a sporting bike in it's day, with a top speed of around 80mph from it's 500cc OHV engine; the more sprightly OHV machines (e.g. the G3 & G3L Matchless machines) were normally "bagged" by officers or NCOs. The ES2 was one down from the true "super sports" Norton singles, the Internationals, which had overhead cam engines, & infinitely better than the plodding 16H. It is in fact a 1938 model, as the "cows udder" silencer mentioned above proves, as it was only fitted for this one year.
I'll try & scan the picture in & post it for you later in the week, though I'm a bit unclear about copyright laws in relation to this.
Incidentally if you look closely, you can see what looks like the formation badge of 3rd ID on the riders shoulder. Interestingly, he isn't wearing the usual "Pantaloons Motorcyclists" (riding breeches), or the tall lace-up riding boots normally issued to despatch riders, MPs or other soldiers whose duties required them to ride motorcycles. He is wearing the early type "pulp helmet", later replaced by a metal domed version, identical to that issued to tank crews.
