Quote:
Displaying arms which are not registered to you, or which you do not have a right to, can lead to prosecution in countries such as Scotland, where heraldry is carefully regulated. In other countries you could just look foolish.
-- http://www.heraldry-scotland.co.uk/beginners.html

So pretty much anyone in scotland with a mug or t-shirt with a unregistered coat of arms, even if they designed it themselves, could be proscuted? What are the penaltiss for doing so? and has it been proscuted in recent times?