... bolster their bottom line. In the 1750s, millers went too far by adding powdered white lead to their flour, which poisoned many people. After a riot in which a number of the offending mills were sacked, consumer-owned flour mills were formed and the model was fairly widely adopted. A bunch of records from the #HullAntiMill, which was formed towards the end of that wave, have been preserved, but lots of that history has been lost...

https://archiveshub.jisc.ac.uk/search/archives/2b5dbe96-674a-361e-b997-aeebdcb7ab90