Amicus Film with Terence Stamp and Robert Vaughn.
From IMDb:
Since his birth, 30 years ago, John Soames is in a coma. Now he's operated and brought to life in a neurologic clinic. A tense plan shall make him develop from a 30 years old baby to a man, but there's no time for the love and care a normal baby would receive. He manages to flee...
This has crept out in the US via Sony’s Movies on Demand service.
[amazondvd]The Mind of Mr. Soames[/amazondvd]