I'll arrange a date and let you know.
This what Richard Dunn says about the name
"The most likely explanation of the names, and that "approved" by the English Place-Name Society, is as follows:

Nempnett, from the Old English word emnet meaning flat place, so that this name means "at the flat place" or similar. Probably applied to the area around the church, which is flat compared to the rest of the parish.

Thrubwell, from the Old English words thrybb and well meaning a gushing well or spring. Probably applied originally to a place in the north of the parish where springs are common."

PeteG