He succeeded his father as fourth Baron Henniker in July 1832 but as this was an Irish peerage it did not entitle him to a seat in the House of Lords.
In December of the same year he was instead elected to the House of Commons for the newly created constituency of East Suffolk, which he represented until 1846 and again from 1856[2] to 1866.
This title gave him and his descendants an automatic seat in the House of Lords.
[3] Lord Henniker married Anna, daughter of Lieutenant-General Sir Edward Kerrison, 1st Baronet, in 1836.
[4] He died at 6 Grafton Street, Mayfair, on 16 April 1870, aged 69, and was succeeded in his titles by his son John.