In his book "The Dirty War", Martin Dillon adamantly dismissed the allegation that Nairac had been present. He believed it was based on the erroneous linkage of Nairac to the earlier murder of IRA man John Francis Green in County Monaghan – the same pistol was used in both attacks. Regarding the soldier with the English accent, Dillon wrote:  it is to say the least highly dubious, if not absurd to conclude from such superficial factors that Nairac was present at the Miami murders. I was told by a source close to "Mr. A" and another loyalist hitman that Nairac was not present at either murder [Miami Showband and John Francis Green]. Travers had described the English-accented man as having been of normal height and thought he had fair hair, but was not certain. Travers was not able to positively identify Nairac, from his photograph, as having been the man at Buskhill. The RTÉ programme "Today Tonight" aired a documentary in 1987 in which it claimed that former UVF associates of Harris Boyle revealed to the programme's researchers that Nairac had deliberately detonated the bomb to eliminate Boyle, with whom he had carried out the Green killing. Journalist Emily O'Reilly noted in the "Sunday Tribune" that none of the three men convicted of the massacre ever implicated Nairac in the attack or accused him of causing Boyle's death. Retired diplomat Alistair Kerr wrote a biography of Nairac entitled "Betrayal: the Murder of Robert Nairac" published in 2015, which offers documentary evidence that clears Nairac of having been at Buskhill overseeing the attack. According to Kerr, on 31 July 1975 at 4 am Nairac had started out on a road journey from London to Scotland for a fishing holiday. He also provides other alibis for Nairac precluding his presence at the scenes of both the John Francis Green killing and the Dublin and Monaghan bombings. However Ministry of Defence documents released in 2020 contain suggestions that Nairac acquired equipment and uniforms for the Miami Showband killers, and that he was responsible for the planning and execution of the attack itself. The band's road manager, Brian Maguire stated that when he drove away from Banbridge in the lead, a few minutes ahead of the band's minibus, he passed through security barriers manned by the RUC. As Maguire continued ahead, up the by-pass towards Newry, he noticed a blue Triumph 2000 pulling-out from where it had been parked in a lay-by.