Thank you so, so much for your prompt reply. Fits so well as Thomas and Lydia had children, Thomas, John, William and James so the names follow through.
Do you know if "Hartford Militia" and "quartered in this town" have anything to do with Essex or would I be right in perhaps supposing that William's roots are in Herts and he was serving in the Hertfordshire Militia. If so, I am quite excited as I have been fully aware of the militia and it would be so great to find a serving militia man.
Will do some more searching.
Thanks again