And the question as to why he flew to England remains open - was he tricked by the British Secret Service believing that a peace treaty with England was possible, was he going to meet with Lord Hamilton, ... etc?
[Some of the remains of the Hess plane (Ju-88) are on display at the Imperial War Museum in London.]
Footnote on the Imperial War Museum: You know it is situated on the grounds of old Bethlem (Bedlam) Hospital? :>)