Wendy, Scrim and Ady,
thanks for your guidance.
Wendy, I have just been looking at leodis.net, which is mind blowing (and plenty of photos of the City Square area). I will suggest to my mate that submitting the piccie to them would be a capital idea.
Scrimmers, Ah, date no earlier than late 1917. YMCA will be checked out.
I thought, too, that it was a convenient space for a photo, yet City square is more open.
Googling Bryde's brings up Scandinavian web sites, so maybe they operate out of that region now.
Ady, thank you for your kindness in posting a link on Yorkshire Indexers.
Cheers to you all,
Dave