This makes sense. My great-great grandfather came to Illinois in the US with his two brothers while the other 10-11 siblings stayed in the Forest. One brother went back as well and eventually settled in Wales. I heard mixed messages on the whole concept. I've heard colliers tended to follow the work, but I've also heard that the Forest was significantly localized with people tending to stay in a particular area. Thank you for all the clarification. My great-great grandfather came over to the US in 1893, so I'm sure the Forest was a different place at that time.