inspector-general of military prisons, who should also supervise provost and regimental cells. Jebb was appointed to this office on 27 December 1844 in addition to his other duties. Subsequently it was held by the officer at the head of civil prisons, at this period a post held by an officer of the Royal Engineers.

Jebb was promoted lieutenant-colonel on 16 April 1847. On 1 May 1849 his appointment as commissioner of Pentonville prison was renewed. In 1850, a board, called the Directors of Convict