I'm not sure if it's a Blu-ray release or a DVD release. Here's what the website says:

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The Man Who Haunted Himself [Blu-ray] 27 May, 2013.

Roger Moore gives a career-defining performance as a businessman whose existence is reshaped by malevolent forces in this taut psychological thriller directed by Ealing Films veteran Basil Dearden. Made at a point in his career post-Saint and pre-Persuaders, this is the film that showcased Moore’s big-screen charisma and ultimately lead to him taking over the role of James Bond. The Man Who Haunted Himself is featured here in a brand-new High Definition transfer from original film elements in its as-exhibited theatrical aspect ratio.

Harold Pelham, a partner in a large electronics firm, finds himself in bewildering circumstances after recovering from a near-fatal car accident. What causes him to renounce his high business principles? Why do friends and colleagues repeatedly sight him in places he has never been? And why does Julie, an attractive girl he has seen only once, claim such an intimate relationship with him? Does Pelham really have a doppelganger – or is he losing his mind?

SPECIAL FEATURES:
-DVD of new HD transfer of main feature in as-exhibited theatrical aspect ratio
-Full Frame 4:3, as-filmed version of main feature
-Feature commentary
-Original theatrical trailer
-Music-only audio
-Image gallery
-Promotional material gallery
-Promotional material PDFs

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I'm guessing maybe it's a combo pack release as the site lists it as a Blu-ray and lists a DVD in the extra features?

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