He was a younger son of Sir John Warrender, 2nd Baronet and his wife Henrietta Johnston, daughter of Sir Patrick Johnston. In 1772, he succeeded his father as baronet. Warrender served with the Royal Horse Guards and fought in the Battle of Minden in 1759. Eventually he became a Lieutenant-Colonel of the 11th Regiment of Dragoons. Warrender was Member of Parliament (MP) for Haddington Burghs from 1768 until 1774. Between 1771 and 1791, he was King's Remembrancer of the Court of Exchequer.
- "Leigh Rayment - Baronetage". Retrieved 15 April 209. Check date values in:
- Kimber, Edward (1771). Richard Johnson, ed. The Baronetage of England: Containing a Genealogical and Historical Account of All the English Baronets. vol. III. London: Thomas Wotton. p. 50.
- Burke, John (1832). A Genealogical and Heraldic History of the Peerage and Baronetage of the British Empire. vol. II (4th ed.). London: Henry Colburn and Richard Bentley. p. 589.
- "ThePeerage - Lt-Col Sir Patrick Warrender of Lochend, 3rd Bt". Retrieved 7 February 2009.
- "Leigh Rayment - British House of Commons. Haddington Burghs". Retrieved 15 April 2009.
- Debrett, John (1824). Debrett's Baronetage of England. vol. I (5th ed.). London: G. Woodfall. p. 416.
|Parliament of Great Britain|
Sir Hew Dalrymple
|Member of Parliament for Haddington Burghs
|Baronetage of Great Britain|
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