Wilmot was the second son of Robert Wilmot (1669–1738), of Osmaston Hall, near Derby, and his wife Ursula, who was the daughter of Sir Samuel Marow, Bt, of Berkswell, Warwickshire.[1] His paternal grandfather was Sir Nicholas Wilmot (1611–1682), a serjeant-at-law knighted in 1674.[1] His elder brother Robert (c.1708–1772) was another lawyer who went into the service of the crown, was knighted in 1739 and created a baronet (Wilmot of Osmaston) in 1772.[1]
On 3 April 1743, Wilmot married Sarah Rivett (1721–1772), a daughter of Thomas Rivett of Derby, with whom he had three sons and two daughters.[1] His eldest son, another Robert, died in Bengal,[1] while his younger son, John Eardley Wilmot, became a barrister and wrote his father's memoirs.[3] One of his daughters, Maria, married the Jewish City of London banker Sampson Gideon, who changed his surname to Eardley and in 1789 became Sampson Eardley, 1st Baron Eardley.[4][5] Another daughter Elizabeth married Thomas Blomefield, Inspector of Artillery and Superintendent of the Royal Brass Foundry on 27 July 1788.[6]
I hear every body speak of your nephew Wilmot, as one of the most hopeful young gentlemen at the Bar... he may, without presumption aspire to any thing in the course of his profession; and has no small encouragement from what he has seen, since his acquaintance with Westminster-hall, in four or five of the long Robe, who have reached the top in the prime of their years.
He joined the Midland Circuit and was an advocate at the Derby Assizes. Dudley Ryder appointed Wilmot a junior counsel to the Treasury, and in 1753 he was offered promotion to King's Counsel and to serjeant-at-law, but declined and returned to Derbyshire.[1] However, in February 1755 he accepted the appointment as a judge of the King's Bench and serjeant-at-law, and was knighted. In 1756, he became a Commissioner of the Great Seal and was proposed as Lord Chancellor, but said he didn't want it.[1] On 15 March 1757, when he was holding the assizes at Worcester, he narrowly escaped death when the roof of the courthouse collapsed, killing several people and injuring many more.[9]
William Blackstone, author of the famous Commentaries on the Laws of England (four volumes, 1765–1769) was one of Wilmot's close friends.[1] Blackstone wrote to him on 22 February 1766, after the publication of the first volume of the Commentaries: "Sir, Lord Mansfield did me the honour to inform me, that both you and himself had been so obliging as to mark out a few of the many errors, which I am sensible are to be met with in the Book which I lately published. Nothing can flatter me so much as that you have thought it worth the pains of such a revisal."[3]
In August 1766, Wilmot became Chief Justice of the Common Pleas, and in September 1766 joined the Privy Council. In 1770, he again refused appointment as Lord Chancellor, and in January 1771 resigned as Chief Justice.[1]
^Eardley-Wilmot, J. E., Historical view of the Commission for Enquiring into the Losses, Services, and Claims of the American Loyalists, at the close of the war between Great Britain and her Colonies, in 1783 (1815, reprinted by Gregg Press, Boston, 1972)