Jacob Von Hogflume is the fictitious inventor of time traveller, as well as a former and future resident of London. Invented by Dave Askwith and Alex Normanton, and documented in their book "Signs of Life", the Von Hogflume sign proclaimed to mark the 2063 residence of the 19th century inventor. This sign was one of many subversive signs created and posted throughout London by the duo.

http://entertainment.timesonline.co.uk/tol/arts_and_entertainment/article774916.ece