Sir Jimmy Savile's former PA, Janet Cope, told ITV1 Exposure, "Jimmy was untouchable".
Ms Cope claims Savile had "total" access at the high-security hospital and "was very proud of the fact that he spoke to all these very high-profile poorly criminals".
ITV1 Exposure Update: The Jimmy Savile Investigation will be broadcast at 10.35pm tonight.
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The Commons earlier overturned amendments made to the European Union (Withdrawal Agreement) Bill by defiant peers.
The US Treasury Secretary has also highlighted the prospect of retaliatory trade tariffs if the UK presses ahead with the planned levy.
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