Right - here we are again. I went back and had another go. What does everyone think?
(perhaps I should reduce them to be seen on one screen? Ah well, I'll remember that if I ever put the project online!)
I managed to find a time without too much traffic (and, thinking about it, no car parked on the road - which I've realised was why I used the other side), and I think this is much closer. I've thought about it, and realised that I was also confused by the 4/3 format, which is much broader than the original postcard format, and I've cropped the bottom of the comparison shot (I tried to match the chimney up with the top edge as per the postcard) to a similar aspect ratio to the original as well. I didn't get the original photographer's list to starboard, though - in my defence I was trying to line the shot up with one hand, compare with the original in the other, and listen out for traffic, so I was a bit short of spare brain to think with. If you are fussy about it, try lifting the bottom left-hand corner of your monitor when you look at the second picture!
An unexpected discovery is that the equivalent focal length is approximately 65mm, not the 165mm we were thinking.
Looking forward to hearing your thoughts,
Adrian