Wow. I’ve just done a bit of Wiki research into the Cardiff bread riots. It seems to have a racial element. It’s amazing what causes riots in deprived areas. Hot weather does seem to play a significant factor.
In 1991, tensions were raised when a dispute broke out between two shopkeepers in Ely over council restrictions over what each shop could sell.[4] Abdul Waheed, a Pakistani-born shopowner who had opened his store at 70 Wilson Road seven years earlier,[5] was accused by some locals of trying to put a white shopkeeper,[3] Carl Agius, who was of Maltese descent,[4][5] out of business.
Waheed had obtained a court injunction that banned the rival shop from selling bread and other food products at discounted prices.[2] The pair had been involved in a long running dispute over the sale of certain products that had been ongoing for two years prior to the incident.
https://en.m.wikipedia.org/wiki/Cardiff_Ely_bread_riots