BW land is public, but they have a "no cycling" byelaw, and the permit is their way of allowing cycling without the cyclist breaking the byelaw. They don't though have a meaningful system for enforcement, it used to be one patrol officer per canal, and cycling without a permit wasn't high on their list of things to do, mostly it was boat licences, so the chances of being stopped are small and the chance of being prosecuted even smaller.
BW land is public, but they have a "no cycling" byelaw, and the permit is their way of allowing cycling without the cyclist breaking the byelaw. They don't though have a meaningful system for enforcement, it used to be one patrol officer per canal, and cycling without a permit wasn't high on their list of things to do, mostly it was boat licences, so the chances of being stopped are small and the chance of being prosecuted even smaller.