Aglionby was educated at Sedbergh School, and thereafter at St John's College, Cambridge, where he graduated with a BA in 1813 and a MA in 1816.
[2] Called to the bar at Lincoln's Inn in June 1816, he became a special pleader on the Northern Circuit.
[1] Like many others in western Cumberland, he was a strong supporter of the secret ballot, prompted part by the systematic bribery and intimidation which was used in 1832 to secure the election of the Tory MP Matthias Attwood in Whitehaven.
[7] In April 1833 Aglionby voted in favour of a motion proposed by City of London MP George Grote[8] "That all elections of Members to serve in Parliament should in future be by ballot".
He married a Mrs. Sadd on 2 March 1852, at his manor of Caterham, Surrey; they had no children.