1871 Census Oswald Bloxsome is in Eye, Hersfordshire, living at Berrington Hall.
(Berrington Hall is now a National Trust House)
He is born c 1802 Durley, Gloucestershire (Dursley I presume)
A large Household with 12 Servants, a Governess, and Coachman/Groom/Gamekeeper at a separate residence on the Estate.
Oswald Jnr is Widowed and has 6 Children, 3 girls/3 boys.
So there must be descendants out there!
1861 Oswald/Henrietta are in Adderstone, Northumberland.
Address Adderstone House
4 of their Grandchildren are there, all born Australia.
http://www.nationaltrust.org.uk/berrington-hall/Trish

EDIT;
Quote from a Family Tree;
Bloxsome’s Sydney home, The Rangers at Mosman Bay, was built with convict labour in the early 1840s to the design of the Sydney architect John Frederick Hilly. The dining-room of the house was decorated later in the 1840s by Oswald Brierly with a mural showing HMS Rattlesnake in a storm, but both house and mural have long been destroyed.