I have indeed managed it! The process is actually straightforward. I will however need to keep practising as my technique for highlighting the area to copy is poor (I have never been that good with the touch pad on my laptop!). I have nonetheless saved a couple of snips from my large batch of PDFs and can see I am going to be busy for a while. (The second one I even managed to enlarge enough to print it off!). So again my thanks to Jen.
Re Frederick Michael Railton he seems to have been caught and given seven years. He was in Portland Prison in 1881.There are some very detailed prison records, including his mugshot, on FindMyPast.
William