HARRY Martindale, the York heating engineer who famously saw Roman soldiers marching through the cellar wall of the Treasurer’s House in 1953, will relive his teenage experience at the York GhostFest 2012.

Harry is the guest celebrity to be interviewed at Derek Acorah and Richard Felix’s Psychic and Science show on September 15 at the Eye of York, in front of Clifford’s Tower, on “the world’s first interactive paranormal theatre tour”.

Derek and Richard first worked together on Living TV’s Most Haunted and are now embarking on their travels to “educate the public on the realities of the paranormal”.

“Harry’s story is in our opinion possibly the best ghost story in the world,” say the two Godfathers of the Paranormal.

The Psychic and Science show will break away from the normal Hollywood or TV ghost show, where the scare factor was always prominent. “Instead we’ll conduct various experiments and demonstrations and test theories to open people’s eyes and prove that the realities behind ghosts are far more fascinating than the Scooby Doo side of things,” say Derek and Richard.

The September 15 show in England’s most haunted city will be hosted by Edd Felix, who, despite being a sceptic, has been heavily involved in the world of the paranormal for ten years.

Throughout next Saturday’s gathering, audience members will be randomly selected to take part in the psychic and scientific experiments with Derek and Richard.

The evening will feature a psychic fair, readings from Derek Acorah and Richard Felix’s explanation of his theories on what a ghost really is.

Further events will be glass divination, table tilting and a human pendulum with audience participation; a question-and-answer session with Derek and Richard; and the Harry Martindale’s interview.

In the grand finale, Derek and Richard will try to bring an apparition out of the stonework of the old York Prison, using the Stone Tape Projector. “This will test our theory of traumatic events being recorded in the fabric of a building – in other words, can the walls talk?” ask the psychic and scientific investigators.

The show will run from 7.30pm to 11pm, preceded by a Meet and Greet with Derek and Richard for VIP ticket holders from 5.30pm to 6.30pm.

VIP tickets holders also will receive front-row seating; a champagne and strawberries reception; a signed photo from Derek and Richard; and a collectable memento of the evening.

Standard tickets cost £25, VIP tickets, £50, on 0800 027 7928 or online at psychicandscience.tv