A couple of decades ago a friend moved into a top-floor flat in Lansdown Crescent, Bath (the one that's higher up the hill – and hence above – Royal Crescent). Discovered he had access to loft space, which contained fancy lighting, heating, hydroponics and a substantial quantity of withered plants. Presumably left by the previous tenant, who may or may not have had to leave in a hurry. Or possibly property of the landlord?!