The escutcheon above the door seems to say "Leng". The only Leng I know is the Plateau of Leng mentioned by Lovecraft a few times, first in The Dream-Quest of Unknown Kadath, though I know it best from At the Mountains of Madness. I assume it's not that one.
Supplemental:
After reaching out on Twitter to Tristan Fowler, the only other person I could find who'd researched the motto on the side of the stone walkway between this door and the house (which says "Conflict tests the warrior"), he let me know that it actually says "Leny". Turns out this is Leny House (6 Clifton Park):
attached ashlar gateway to No.6 has a semicircular-arched doorway with panelled surround, between Jacobethan pilasters, and a cartouche inscribed LENY
GPS Coordinates:
51.45861, -2.61855
Neighbourhood: Clifton College
Street: College Road
