By one of those freaks of chance came upon a reference to a popular entertainer who was famous in his day but now forgotten. Known as Leslie Stuart, he was born Thomas Augustine Barrett, and looks to be the brother of a granny of one of my grannies.
He has a Wikipedia article under his professional name, adopted as his regular name, Leslie Stuart and had a fascinating career. It also answers some questions about why and what my previous known family were doing.
Apparently, there are a couple of expert biographies to go at as well. So I have been busy. This find is one of the upsides of tracking family. On the other hand there are downsides. The lady in question married a Rooney.
Well you win a few and you lose a few.