No, I am afraid they are not. I believe that the three films were made by three different companies (Rank and Paramount were two of them IIRC) and the DVD rights are held by three different distributors (Network, Paramount and MGM), so unless those three can reach some sort of deal a box set is unlikely to appear. The two later non-Deighton TV films, Bullet to Beijing and Midnight in St Petersburg are available in a box set which is available from all the usual suspects.

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