Lord Owen, who is a former health minister and supported staying in the European Community in 1975, has already warned that the TTIP negotiations would wreck the NHS.
He said that the papers revealed by the Dutch branch of Greenpeace have confirmed his worst fears.
He said: “No one can justify the secret trade negotiations the Commission have signed up for in TTIP. Despite protests little has been done to redress its errors.
“No regard for the social purpose of healthcare and the erosion of health as a Member State responsibility. The EU/Eurozone from 1992, in marked contrast to the old European Community of 1975, creeps into every nook and cranny of our life.
It is now becoming entrenched in the NHS and this June we have a once-in-a-lifetime opportunity to get [it] out. If we vote Leave – we will be able to protect our NHS from EU interference.”