 On pages 89 and 90 of his book, "The Dublin Bombings and the Murder Triangle", Tiernan wrote
One former UVF man now in his seventies, who was a member of Billy's squad and whom Gardai named as having been involved in the Dublin bombings, told me during research for this book that Billy worked as a UVF agent for army intelligence officers in Lisburn.He said two middle-ranking officers in plain clothes travelled down from Lisburn once a fortnight in a van to meet Billy and give him instructions on what they wanted done.They would visit his house from time to time and they took him fishing to Banbridge.