William WILLIS 1833 Crudwell/Cromhall (General)
There is still some confusion, I'd put a small bet on Crudwell on the Wilts/Glos border - if the parents are from Minety and Hullavington for example.
http://www.genuki.org.uk/big/eng/WIL/Crudwell/index.htm
Cromhall near Wickwar / Wotton u Edge would be my second choice at this stage.
http://www.genuki.org.uk/big/eng/GLS/Cromhall/index.html if only for its proximity to a coalfield.