Soon after coming of age Coningsby was returned on his own interest for Leominster, which he continued to represent as a Whig in every Parliament for the next thirty years. Appointed lord lieutenant of Herefordshire and Radnorshire at George I’s accession, he set himself to destroy the political influence of the Harley family, with whom he had an hereditary feud. He was one of the managers of Oxford’s impeachment, which he moved in the following terms:
The worthy chairman of the committee [Walpole] has impeached the hand [Bolingbroke], but I impeach the head; he has impeached the clerk, and I the justice; he has impeached the scholar, and I the master.
In 1716 he spoke for the septennial bill. Created an English peer at the end of the session, he was raised to an earldom in 1719, soon afterwards writing to Sunderland from Herefordshire:
Ever since I came down my house has been a fair and for six days of the seven I have not a moment to myself, but I begrudge neither my trouble, my time, nor expense I am at ... Since God has enabled me with the assistance I have had from the Government, my Lord Chancellor, and the Duke of Newcastle to recover Radnorshire entirely and this county in great measure out of the hands of my Lord Oxford, the worst of peers, the Bishop of Hereford, the worst of Bishops, and Baron Price [father of Uvedale Price], the worst of judges, and this for the service of the best of Kings and the best of administrations.
19 June 1719, Sunderland (Blenheim) mss.
He was in fact engaged in a series of unsuccessful lawsuits with his neighbours, the Leominster corporation, and the Crown, arising from the ill-founded views which he had formed, after extensive historical researches, as to his rights as lord of the manors of Marden and Leominster.
He died 1 May 1729.
