For classic examples of design stuidity.
From the peoples republic of Bangor..
Does the sign refer to the footpath/cyclepath, the road or both?
There is no way of knowing.
Sustrans cycle route 51 sends you through Bicester and through a pedestrian area. (Can't remember whether its a no entry or no cycling sign now though)
It also goes through Milton Keynes shopping centre with, "No cycling on footway," signs which are blue rectangles with white writing, so reccommendatory. I've never worked out whether it is only a footway or a shared use cycle path.