On 10 May 1941, at about 6:00 P.M., Hess took off from Augsburg in a Messerschmitt Bf 110,
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He remained in the Tower until 20 May 1941.

After being held in the Maryhill army barracks, he was transferred to Mytchett Place near Aldershot. The house was fitted with microphones and sound recording equipment. Frank Foley and two other MI6 officers were given the job of debriefing Hess - or "Jonathan", as he was now known. Churchill's instructions were that Hess should be strictly isolated, and that every effort should be taken to get any information out of him that might be useful.[18] British Intelligence personnel, Ian Fleming in particular, proposed that Aleister Crowley should question Hess on Nazi interest in the occult.