Thanks for your detailed response @nevermodern, great to hear about the history. It's a really intriguing image - something vaguely utopian and new age-y about it! Plus you've solved all our servant worries in one fell swoop (although I can see why a porter would seem like a good idea with that hill)

I have a bit of an interest London history myself, and recently wrote an article about coffee-stalls in South London for London Fictions.