John Usborne                       

Born circa 1757
Married Anne Cobb(b.1755), his first cousin, daughter of Mary Usborne/Cobb    
Will proved February 16th 1804 at Great Amwell.   

Thunder Hall         
Following his father, John started his career as a corn merchant living in Chatham. In 1801 he was a cow-keeper before becoming a schoolmaster in Gillingham, Kent. He was described in the will of his uncle John as being lame.
He inherited various properties on the death of his father in 1782 which had belonged to uncle John. He surrendered much of this property to his uncle William in exchange for "various legacies". He also inherited Thunder Hall,  a large mid-19th century alteration to a 17th century mansion (the council's description) on the edge of the old part of Ware town (sold in 1795).  It is now partly empty and decaying, and partly converted into flats. 

Will dated December 7th 1801:  I bequeath my freehold estate in Starr lane & the Common wharf in the parish of Ware and two Cow-Leazes in Amwell Marsh to my son John Reddish Usborne, said son to be kept at school till he is 14.