[sungrass]

He devised a plan to see if Derek was deliberately deceiving the public.

While on a shoot at Bodmin gaol he invented a long-dead South African jailer called Kreed Kafer - an anagram of Derek Faker.

"I wrote the name down and asked another member of the crew to mention it to Derek before filming.

"I honestly didn't think Derek would take the bait. But during the filming he actually got possessed by my fictional character!"

On the next shoot at Prideaux Place, Cornwall, Ciaran made up another fictional character, highwayman Rik Eedles - an anagram of Derek Lies. Sure enough, Derek made contact with the dead outlaw.