Is there any documented cases of someone prosecuted for cycling on a footpath or cycling where there’s no public access rights at all? I’ve searched the web to no avail.
The question has been raised on here before and the general consensus then was that there haven’t been any succesful prosecutions, though I wouldn’t quote that.
What is clear, is that it’s a civil matter between you and the landowner. And if it ever reached a courtroom, it’s not entirely clear if a bicycle would be seen as a ‘natural accompaniment’, for which case law would provide a useful guide.
One problem with erecting signs like this is the conflict it causes. Between people sharing the same space for the same reasons. From first hand experience they help support prejudices.