I was caching in London today with my son Bobcat, We were mainly concentrating on historical caches - the virtuals and some multi-part puzzles.
We had guessed where this one was going to be before we arrived. It's years since we've been in there - we really ought to go back again.
We noted down the answers and took some pictures to prove that we were here. I've now received my confirmation email so now logging as a find.