John senior was in partnership with his son Joseph Crew Boulcott (1788–1850) with a yard in Narrow St, Ratcliff, London, by June 1810.

The first certain reference to his son, John Ellerker Boulcott, comes in 1821 when he was operating as a shipbroker from premises at 21 Water Lane, London.

[7] He also seems to have had a sideline as a ship biscuit maker by 1823 in partnership with other members of the Boulcott and Hill families and this continued till at least 1842.

These were Atlas (1814–18), L'Aigle (from 1818 to 1829), Mary (1824–1847), Harriet (1834–1839),[9] Hopewell (1818–1825), Rochester (1818–1821),[10] Vittoria (1829–1830), Albion (1829–1832), Grant (1843–1853), Governor (1843–1849), Rover (1844–1848) William (1850–1851) and Brougham (1843–1853).

[12] The captain of one of his four South Sea whaling ships named an atoll in the Pacific Mary Boulcott Island.

In 1840 John Boulcott had to vacate his home, Stratford House, Essex, on account of the construction of the Eastern Counties Railway.

John Ellerker Boulcott was 70 years of age when he died on 9 June 1855 at 8 Onslow Square, Ewell, Epsom, Surrey, England.