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"It clearly helps to make Philip better known to the world, which I think he does deserve to be," she said.

Kemp, also known for his portrayal of the Swan in Matthew Bourne's Swan Lake, admitted Kilmer's acting methods on set sometimes appeared to be "crazy" while at other times there were "moments of absolute genius".

Now a woman in her mid 70s, she had never known much about her grandfather, and paid for the private test to see if it threw up anything unusual.

It's not known exactly when any agreement over donations was reached.

“It’s been known as a problem in the system for years of not knowing where the openings are and how that impacts referrals,” she said in the interview.