TfL's lightening quick response was: “We don't have any speed humps on our roads, we only manage 5 per cent of London's roads (the Red Routes), nor would we install any speed humps on other people's roads. We do support the use of 20 mph zones where they are appropriate and will contribute to cutting road deaths and London boroughs can apply to TfL for funding for road safety measures. However, the placement of speed humps are a matter for the individual borough not TfL.” So it looks like the cock-up was entirely the fault of your council. I’ve seen humps in parking bays in Fulham too, so the disease has spread