That raises interesting theoretical issues. Would people, for example, take their dogs across parish boundaries to foul in the areas where the fines are lower? Somehow, I do not think that such issues are likely to arise. It is likely that the issues   would be similar in adjoining parishes. Such parishes would, for instance, be likely to take a common decision in equity on fines.

Of course, the border could be between a parish in one county and a parish in another, depending on what body had undertaken the arrangements. If, at the end of the day, issues needed to be addressed in regulations and guidance, the capacity to do that would remain. However, I hope that common sense would dictate most of the responses between different authorities.