[1][2] He took part in the 1952 Eastcastle Street mailbag robbery in which £287,000 (equivalent to £10.4 million in 2025) was stolen from a post office van leaving Paddington station.

[1] As a young adult he chose the path of crime to escape poverty, and earned a reputation for reliability and being able to perfect the details and timing of a robbery.

Parliament demanded an explanation from then Postmaster General, Earl de la Warr, as to how such a crime could have happened.

Reynolds said: ""He had been involved in the Eastcastle Street mailbag job, the first major post-war theft when £287,000 was stolen from a post office van on May 21, 1952".

[3] In 1995, Reynolds read Hogan's eulogy at his funeral, and referenced the Eastcastle Street robbery saying, "He was a major face, he was one of Billy Hill's young men, groomed for stardom.

[1] In The Guardian (1995), Duncan Campbell wrote that on the day the Great Train Robbery (1963) took place, "Hogan was in Cannes with a family of French–Iranian millionaires.

"[2] Early police investigations, including file DPP 2/3588 which is closed until 2045, name Terence Hogan among the suspected robbers who took part in the 1963 train robbery, along with Bruce Reynolds, Ronald Edwards, Gordon Goody, John Daly, Michael Ball, Charles Wilson, and Joseph Hartfield.