Fantastic! I used to have that book, but foolishly loaned it out. IIRC, it was the only place I ever saw a picture of the deck that was added to Buffalo IIs, allowing them to carry 17pdr AT guns and trucks on top.
David Fletchers ‘Vanguard of Victory: the 79th Armoured Division also has a (? the same) photo. Page 70 in my edition.
The photo in my book has the gun facing backwards.