Preorders for The Art of Doom: The Dark Ages are now open.

"It's like a classic piece of art. It's like a painter going to a museum and studying the Norman Rockwell painting he's already studied 50 times," Martin explained.

One of the finest medieval wall paintings ever discovered is part of the line-up for this weekend's Heritage Open Days in Coventry.

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One of England's largest 'doom' paintings has been restored in St Thomas's Church, Salisbury. These medieval paintings depict the moment when Christ judges souls to send them to either Heaven or Hell.