[1] He was educated at Aldro preparatory school, Charterhouse and Clare College, Cambridge, from where he graduated BA in 1961; he received his MA in 1968.
He served in the Royal Naval Reserve from 1954 to 1964, seeing active service 1956-8 and reaching the rank of Lieutenant.
Hacking is a qualified barrister and solicitor in England and Wales as well as an Attorney in the United States.
Having sat as a Conservative, in 1998 he defected to Labour over the European and law and order policies of then party leader William Hague.
[3] From 2009 to 2014, he stood in several subsequent by-elections as a crossbencher, but only succeeded in 2021 as a Labour candidate to replace Viscount Simon, 47 years after he first entered the Lords in 1974.