As his father's heir, he was known by his courtesy title, Viscount Jocelyn. For some time he served in the Rifle Brigade but, in 1840 as Military Secretary to Lord Saltoun, he served in the Chinese Expedition. The results of his observations in China were published in a volume entitled "Six Months in China". A second edition of this work, entitled "Six Months with the Chinese Expedition, or Leaves from a Soldier's Note-book," was published in 1841. 
On 27 April 1841 at St. George's, Hanover Square, he married Lady Frances Elizabeth Clavering-Cowper and they became the parents of five children. From 1842 till 1854 he was a Conservative M.P. for King's Lynn and, from February 1845 till July 1846, Secretary of the 
Board of Control. In 1853 he was appointed Lieutenant-Colonel Commandant of the East Sussex Militia. 
His regiment, the East Essex Militia, was quartered in the Tower, and for some time diarrhoea had been prevalent. To allay by his example the men's fears that the place was unhealthy, he decided to 
sleep at the Tower. Two privates died of Asiatic cholera, and he found himself indisposed. On his way to his residence at Kew, he became so ill that he drove to Lord Palmerstons's house, and there, on 12 August 1854 aged only thirty-eight, he too died of cholera. His widow survived until 26 March 1880 when she died in Cannes.
 

Source: Leo van de Pas