The youngest son of General Sir C. W. Doyle, he was first attached to the British Mission in Washington in 1825. He was appointed in 1829 to Madrid. In 1831 in Madrid he visited one of his father's close friends, José de Palafox. Percy Doyle was appointed in 1836 Paid Attaché at Constantinople. He was appointed on 6 December 1842 Secretary of Legation to Mexico and was appointed on 4 January 1843 British Chargé d'Affaires to Mexico but diplomatic relations were broken off later in that year because of an incident involving Antonio López de Santa Anna. In 1847 Doyle was reappointed as British Chargé d'Affaires to Mexico and, embarking aboard HMS Vixen on 13 October 1847, arrived in Mexico in December of that year. From 24 December 1851 to 19 February 1858 Doyle was British Minister Plenipotentiary to Mexico. However, his heath failed him in 1856 and in 1858 he retired from the Diplomatic Service on a pension. In March 1858 he was appointed CB (Companion of the Order of the Bath).
Doyle’s collection of Mexican antiquities, made ‘during his residence in that republic’, was sold at auction by Sotheby’s on 3/4 January 1859 for a total of £382. 5s. 6d. .... Doyle appears to have continued to collect, but concentrated on European material. No longer employed, but with a good pension, he seems to have been a ‘man about town’ on the fringes of the royal family, frequenting the theatre, court levées and other society occasions. ... He never married.
- Boase, Frederic (1892). Modern English Biography: A-H. p. 911. (Several sources give Percy William Doyle's year of birth as 1804 – the year 1804 is definitely wrong because Percy William Doyle's older brother John Sydney Doyle was born in May 1804.)
- Sheppard, Edgar, ed. (1906). George, Duke of Cambridge: a memoir of his private life. Vol. II. 1871–1904. p. 162. (Percy William Doyle died on the morning of 21 February 1887 at the age of 81.)
- "Doyle, Percy William". The National Archives, UK.
- "Doyle, Percy William". The British Museum.
- Rogers, Graciela Iglesias (2013). British Liberators in the Age of Napoleon. p. 133.
- Parkinson, Jonathan (2018). The Royal Navy, China Station: 1864–1914. p. 91.
- Haydn, Joseph (1851). Beatson's Political Index Modernised. The Book of Dignities. p. 86.
- Parkinson, Jonathan (2018). The Royal Navy, China Station: 1864–1914. p. 80.
- Jones, Raymond A. (1983). The British Diplomatic Service, 1815–1914. Waterloo, Canada: Wilfrid Laurier University Press. p. 20.