‘The amount of surveillance in the North was mind-blowing’

Sean Hartnett has penned a book that will rankle British intelligence. He talks to Cormac O’Keeffe

FOR a Corkman, coming from a republican family, Sean Hartnett took the road less travelled.

From being on the verge of joining the IRA, he enlisted in the British army and ended up working in a top-secret surveillance unit in Northern Ireland.