Here we have St Paul`s Cathedral.
Now I must have been looking at something else whilst I set your teaser as I said "This card was also issued by four other manufacturers - and that is your guessing game for this week". Unfortunately I was looking at "Interesting Buildings". But I will stand up and say I was wrong. I would have liked to find that out earlier, as it is now half past ten - but now it is morning and I can see inside my books.
I do know that this set was also issued by W.A. & A.C. Churchman in November 1924, in a different colourway, sometimes it looks black and white, and at others a dark sepia. The reference books call it "unicoloured". It was a small size of 25 cards, and also an extra large set of 12 selected cards, measuring 98 x 66 m/m. The Churchman set is recorded as having been printed by Mardon, Son and Hall. Presumably they either also printed the Hignett version, or bought the artwork - though as the Churchman was only issued in the unicolour, perhaps they just copied from the cards and found the monotone easier to reproduce. In addition the reverses are noted to be "different numbers, but same text, revised". Is this the start of a bigger story? I will do some research on that - and please let me know if you already have...