I'm all in favour of protecting things when they deserve it, there are too many things disappearing year by year. For the time being I will avoid climbing on that high horse.
Nobody has said what you are supposed to do with the pasty crust - the miners used to throw it deep down in the mine to please the knockers. Happy knockers will lead you to the rich lodes. The farm workers throw the crusts out for the birds with the hope that they will stay off the crops.
Bo, in Cornwall thus an expert. Just ask The Barden of England