The sign has been finally moved out of the cycle lane in Selborne Road. Whether this is because of the complaints, or because the contractors are packing up the signs after finishing the work, we will never know. Maybe a more pro-active cyclist than myself got fed up with it and relocated it.
The sign was obstructing the narrow cycle filter lane since at least 29th September. I never saw the sign with any message on it, it appears during this time that it was actually blank.