[Lauren]

He's been outed as fake.
Ciaran set up a test by mentioning in passing that Bodmin Gaol was haunted by a South African jailer called Kreed Kafer.

Derek fell right into the trap and sure enough mentioned that name
Kreed Kafer is an anagram of Derek Faker.


The same test was done again on a ghost called "Rik Eedles" i.e. Derek Lies.