Lockheed Hydraulic Brake of Leamington Spa, United Kingdom (owned by AP Company of London), manufactured hydraulic components for the European market in the 1930s. There may have been a UK ban from 1937 of exports to Germany of military-sensitive items that would prevent a UK component being  found on a German JU-88 or BF-110. Is that true? Such a ban certainly would have included, for example, design specs for the Hurricane.  Would the ban have encompassed hydraulic brake or other seemingly non-military items?   Even if so, arms dealers have way of  routing material through “Neutral” countries to those that seek it.   As someone here has said, how to explain the appearance of a many 1941-vintage German Leicas that later ended up in Royal Navy hands. I would be very interested in knowing the identity of the German Aircraft found at UK crash sites.  This is a minor issue which somehow intrigues me.