But Dr Hiley said the agent they sent was "spectacularly unreliable".

BBC: Fight to clear Derby suffragette Alice Wheeldon's name

Dr Chris Hiley, of the Prostate Cancer Charity, welcomed the research.

BBC: NEWS | Health | Prostate cancer danger predicted

From fresh research, it is Dr Hiley's belief that this "unbalanced fantasist" was a member of an MI5 department facing closure which fabricated this plot against the Wheeldon family to justify keeping their department open.

BBC: Fight to clear Derby suffragette Alice Wheeldon's name