If there is a chief architect of NHS privatisation, then it might be Oliver Letwin. In addition to co-authoring Britain's Biggest Enterprise in 1988 in which he outlines the steps needed to privatise the NHS by stealth, he was part of N.M. Rothchild's Privatisation Unit throughout the 1980s. He has been deeply involved in government policy development ever since.
Also in 1988, he wrote a book entitled:
Privatising the World - a study of international privatisation in theory and practice
In 2004 he told a private meeting that the NHS would not exist within 5 years of a Tory victory. Defenders of Oliver Letwin have said that the comment was taken out of context, however in 2012 the NHS was legally abolished when the 2012 Health and Social Care Act was passed by the Tory-led coalition government that came to power in 2010. So even if Letwin's comment was taken out of context, it has in fact reflected the intentions of that government.