William Mainwaring (English politician) Burdett. Mainwaring had previously resisted Burdett's calls for an inquiry into prison abuses, particularly at Coldbath Fields Prison. Mainwaring was defeated by Burdett but the election was declared void in 1804 and in the following contest William's son George Boulton Mainwaring was elected. The result was reversed in favour of Burdett in 1805 and the back in favour of Mainwaring Junior in 1806. Mainwaring did not contest the 1807 election and Burdett was not elected. He died in 1821, leaving one son. William Mainwaring (English politician) William Mainwaring (6 Oct 1735 – 28 February 1821) was the MP for Middlesex
Townshend Mainwaring Townshend Mainwaring Townshend Mainwaring (16 March 1807 – 25 December 1883) was a British Conservative Party politician. Mainwaring was the second son of the Reverend Charles Mainwaring and Sarah Townshend, daughter of John Townshend. He married Anna Maria Salusbury, the eldest daughter of Colonel John Lloyd Salusbury, in 1837. Mainwaring was first elected MP Denbigh Boroughs in 1841 but stood down at the 1847 election. He returned to parliament for the same seat in 1857 and held it until 1868. In 1840, Mainwaring was High Sheriff of Denbighshire, and he was also at some point a Justice of the Peace