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"Spice is a drug we find endemic in UK prisons," said Prof Chris Pudney.

Prof Bob Harris, a historian and 18th Century specialist at the University of Oxford, says he can understand why the period caught Bowie's attention.

"The Mohock phenomenon emerged in 1712 and became a media frenzy," says Prof Harris.

Prof Harin Sellahewa, professor of computing at the University of Buckingham, said the change in direction could be bad for the charity's future.

Prof Neil Mabbott, an expert in immunopathology at the Roslin Institute, University of Edinburgh, speculates that living to 125 years old might be the upper limit.