Historical pigs of London

This story came to my attention by being mentioned in a Youtube video.  I had not heard of it before.  Here is the Wiki version, from an entry about the medieval St Anthony's Hospital in London:

One source of income, traditional to certain religious foundations dedicated to Saint Anthony the Great of Egypt, was from donated free-range pigs: any pig considered by the supervisor of the London Livestock market unfit to be killed for food was reserved for the use of the Hospital as follows: a proctor of St. Anthony's placed a collar around its neck from which hung a bell. It was then released onto the City streets to scavenge, protected by the status afforded by its bell, from molestation by the population.^[2] it was a virtuous deed to feed these pigs, which quickly fattened and when ready for the table were reclaimed by the Hospital and sold or slaughtered for food.^[3] The privilege appears on occasion to have been abused, as in 1311 one of the Hospital's tenants Roger de Wynchester, was forced to promise the City authorities not to claim pigs found wandering about the City, nor to put bells on "any swine but those given in charity to the house".^[4]