Just caught up with this subject. My step great great grandfather was a rag and bone man until he died in1926. One of his granddaughter told me that after becoming a widower he would have lunch at his daughters house but first put the meal bag on the horse she found it amusing that horse and man would work and eat together. He had another business which was as proprietor of swings at local park. These were the large boat swings don't know how much he charged.
His son in law (my g-grandfather ) was described as a ' scavenger' in one document so must have worked for him at one time. I'm big on recycling so perhaps its hereditary
I'm surprised your friend from Scotland didn't also use the word scavenger as I have heard this word in the North of Scotland. My OH has family from Orkney who were also described as scavengers but for the local Roperie.
MY worst food memory is of my gradmother eating or rather sucking pigs trotters.