Butting in, Sorry
Re Violin and rural NSW in 19thC .... entirely possible that fake "Strads" were plentiful, and perhaps backyard cricket too!
I recently attended 100th birthday celebrations for my Violin teacher, whose father, grandfather and great grandfather all were violin teachers, and all born up around Armidale NSW. My teacher was also concert violinist and lots of info on professional performances online Aust newspapers for my teacher and HER father.
I have just phoned teacher and asked about Fake Strads. She thinks these were very popular in her father's youth and were apparently made in a workshop in The Strand Arcade in Sydney and sold by commission agents touring NSW in wagons (cheaper and easier to transport than pianos etc) Apparently the varish was very poor quality and shrank after exposure to the dry arid air west of the Blue Mountains, this would make everything brittle and frail and the bridge was poorly constructed....
I feel Frederick Henry was most likely his real name, its the name under which he was tried when aged 20. If it is not his real name, then it seems to me that it was certainly his KNOWN BY name.
Have you checked for any births for HENRY around Leeds circa 1810 in case John Lawford or John Mabson were 'settling a personal score' against Freddy afterall Freddy stated in court that he had NO memory of the offence, and no one asked him to name his associate in the crime, and no attempt recorded to find the associate. If you got a Life sentence, and your mate got off and away, would you not try to appeal the sentence or anticipate being asked about your associate and at least ASK questions in the court ... there's a month between the offence and the trial, plenty of time to find your own witnesses or at least advertise in the London newspapers for same

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Teddles