There were rumblings of a new 'Winter of Discontent' as Britain was hit by a wave of strikes. MI5 had even received evidence that a disgruntled army officer was planning to lead the armed services in a mutiny. Tom was sent undercover to investigate. However he was finding the mission increasingly frustrating as he witnessed the difficulties the army were facing.
Meanwhile a rail strike meant that a consignment of nuclear waste was going to have to travel by road, and Zoe was put in charge of ensuring its safe transit. Tom got a breakthrough when Major Curtis invited him to sign a petition. Convinced he was wasting his time, and furious he was having to spy on his own side, he demanded to be taken off the job.
Danny arrived at the barracks with the papers to secure Tom's 'transfer' just as Tom's cover was blown by their unreliable informer. They were both bundled into a military vehicle with the rest of the platoon. Suddenly the plan was afoot as the platoon intercepted the nuclear convoy and redirected the vehicle to an oil storage facility close to London.
Major Curtis attached explosive to the nuclear waste, making the biggest dirty bomb ever seen. He would explode it if his demands weren't met. Tom tried to talk Curtis out of his plan, and seemed to be succeeding. However Harry resolved the situation his own way and got a sniper to kill Curtis, and the death was blamed on a car accident.
When he returned to the office Tom seemed to be a changed man. He felt that Curtis had had genuine complaints that should have been addressed. When Harry then banned him from dating Christine, Tom reacted furiously. He knew he was a pawn in a game that had nothing to do with national security.