The Throckmortons were a prominent Roman Catholic family, who continued to hear mass at the family home Coughton Court, Alcester, Warwickshire. The Catholic Emancipation Acting of 1829 allowed Catholics to hold national office for the first time in almost three hundred years. Throckmorton took advantage of the change in the law to become one of the first Catholic MPs.
At the 1831 general election he was elected Member of Parliament for Berkshire, the location of his third country estate, Buckland Park (though it is now in Oxfordshire).
He held the seat until 1835. He also became a Justice of the Peace and Deputy Lieutenant for Berkshire.
He was High Sheriff of Berkshire in 1843. Throckmorton died at the age of 61.
Throckmorton married Elizabeth Acton, daughter of Sir John Acton, 6th Baronet of Aldenham on 16 July 1829.
10th United Kingdom Parliament. 11th United Kingdom Parliament.