Hi Steve. I can't find anything about this maker either. I'm sure you've investigated whether this might be a son of Zachariah Boyle and a brother to John Boyle who was in partnership with Herbert Minton. Godden's book on Minton says that after the Minton partnership was dissolved John signed partnership papers with his brothers in 1842, without naming any of them. I suppose continuing their father's business. With all you know about the potteries we're far more likely to learn from you than the other way around!