He married Emily Ann Stratton on 18 September 1838; they had ten children, including the Reverend Herbert Walter Barnett who was Vicar of Bracknell 1886–1919.
Barnett played first-class cricket from 1836 to 1839, as a member of Marylebone Cricket Club, making four appearances and totalling 32 runs with a highest score of 17.[4]
He was the principal partner of the bank Barnett, Hoares & Co. which in 1864 became part of Lloyds Bank. He purchased his mansion at 100, Hamilton Terrace, St John's Wood, in 1890.[5]
^ abcCraig, F. W. S. (1989) [1977]. British parliamentary election results 1832–1885 (2nd ed.). Chichester: Parliamentary Research Services. p. 340. ISBN0-900178-26-4.