He was seconded to the New Zealand SAS before working for the Intelligence Services as a psychological warfare officer. Remarkably, instead of publishing the findings of the MoD's own investigation, King suggested to Thatcher that the Government should create another, much more limited and less damaging, inquiry to explain away why Parliament had been seriously misled for a period of years. Mr Wallace feels the inquiry could be the last chance to find out the truth of what happened at Kincora.

Soundings in the office had already been taken, and up to thirty officers had given their approval to the scheme. He joined the Territorial Army in 1961, and later was a marksman in the Ulster Special Constabulary, or 'B Specials'. The conviction was later quashed in the light of new forensic and other evidence that raised serious questions about the dubious nature of the evidence used to convict Wallace initially. It may be that Wallace's allegations about MI5 officers being involved in activities verging on the treasonable were widely known - so if any harm came to him the finger would point directly at them.His career was a counterbalance to the lies and distortions of the Murdoch media empire and its ilk". In the 1980s, to support his claims, Wallace produced a collection of documents, including a series of handwritten notes on material which formed part of the Clockwork Orange project.

He had been part of the Army team preparing for the Widgery Tribunal into the Bloody Sunday killings of protestors in Derry, and in 2002, he testified at the Saville Inquiry into the events. As King had suggested to Thatcher in his memo dated 12 December 1989, that account fell far short of any admission regarding the abuses of children at Kincora, 'Clockwork Orange', or other really contentious issues such as attempts to discredit leading politicians during the 1974 General Elections. He said that his MI5 handler told him to leave McGrath to them (MI5) and he understood that "they used his information to recruit McGrath as an informer.In 1981 three senior care staff at the home were jailed for abusing 11 boys but allegations of a wider ring with links in the political establishment have persisted. John Colin Wallace (born June 1943) is a British former member of Army Intelligence in Northern Ireland and a psychological warfare specialist.