Many thanks for your photos and comments. Sorry if you've not had a reply. I've been AWOL again briefly, but LAMFRT is now back with a vengeance!
Particular apologies to anyone who over the last couple of months has sent in one of those emails along the lines of, "My mate/girlfriend/daughter sent in a picture of me looking like a first-class tosser, and while I can just about see the funny side (no really, ahahahaha) please please please please please take it down". I haven't read your message yet, but I will do very soon. (I'll probably ignore it obviously, but still).
Also, if you find yourself chasing your quarry around a shopping centre or similar and the pictures keep coming out blurry, a video might be worth a try...