Hi,
not relevant to your search for the Turnbulls I'm afraid, but I wondered why your ancestors were moved to Sheffield ?. Was Thomas Mushet related to Robert Forester Mushet etc of Darkhill fame; were your ancestors involved in the family steel-making business which was so-closely linked with Sheffield's steel industry ?
Asking just out of curiosity as I'm a mechanical engineer who'd have loved to have history like this in my family tree !
Thanks J.