Matthew Collins takes a gulp of Guinness and glances over his shoulder. He finds it hard to resist looking behind. That’s what happens, Collins says, when you flip sides.
Once a senior member of the fascist National Front, the 50-year-old turned informant, imprisoning scores of leading far-right figures before running a spy network that helped bring down the British National party. He was also handler to a mole who dismantled a neo-Nazi terror group, an alleged member of which had been plotting to kill a Labour MP.
