You always come up trumps Shaun.

I do have that excellent map but as it's a bit older than 1846 I didn't check it for Richmond Buildings. Of course, as we know, the buildings were there for many years before Nathaniel moved in.
The long road/lane going SE from Richmond Buildings is Richmond Mews.
It doesn't look like the old building on the cnr of Dean St is classed as part of Richmond Buildings (at this point in time at least) however that quote I posted earlier seems to imply that part of Richmond Buildings faced Dean St. Odd numbering on both Richmond Buildings and also Dean St - and the old building that I think
may still remain today isn't numbered.

Deb, look at the name of the street a little to the right and down a bit from Richmond Buildings ...

Queen St - could this be where Ann Fox was born?
