A terrorist bomb-maker who infiltrated the British military should receive a tougher sentence, a former armed forces minister has said.

A "committed" terrorist who infiltrated the British military has been jailed for 18 years for supplying bombs to dissident Irish republicans.

A Royal Marine who lived a "dangerous double life" as a terrorist bomb-maker claims he faked sympathies for the Irish republican cause because he was "paralysed" with fear, a court has heard.