In reply to Trangia:
I can add some further detail to all this, because my great uncle, George Stainforth was involved with Squadron Leader Stanford Tuck in intensive test trials of a captured ME109 at the Royal Aircraft Establishment at Farnborough in June 1940. Stainforth and Tuck were chosen because they were regarded as the best pilots in Britain, Stanford Tuck being the most experienced fighter pilot, and Stainforth one of our leading test pilots, who had broken the world speed record in 1931.
The following extract is from my father's book, Not Found Wanting:
'.. In May, Wing Commander George Stainforth began an exhaustive flight testing programme of [the ME109]. When these tests were completed, Squadron Leader Stanford Tuck, then one of our most experienced fighter pilots of the day, was detailed to go to Farnborough and take part in mock air battles against the Messerschmidt in front of a distinguished audience of senior RAF commanders.
While Stanford Tuck flew the latest models of Hurricane and Spitfire in these trials, George flew the Messerschmidt, and put it through every kind of aerobatic maneouvre used in aerial combat at that time. The Messerschmidt was very fast, faster than the Hurricane, and only slightly slower than the Spitfire. It had good controls, George reported, but a poor turning circle, being slightly out-turned by both our fighters. Stanford Tuck had only to put his Hurricane in a tight turn for the ME109 to over-run him and for him to end up on the German fighter's tail. Also George found in a steep dive the Messerschmidt's flaps were apt to deploy differently, flipping the aircraft onto its back! Battle tactics developed during those trials were put to invaluable use in the Battle of Britain later that summer, and saved many lives.'
Another account on the internet says:
'[Stanford Tuck's] task was to take part in comparison trials of a captured Me-109E and a Spitfire Mark II. The tests began with Stainforth flying the Me-109 and Tuck flying the Spitfire in level flight, dives and turns, and at various speeds at different altitudes.
Halfway through the trials the pilots switched aircraft. Tuck reported that the Me-109 was "without a doubt a most delightful little airplane--not as maneuverable as the Spit...but certainly it was slightly faster, and altogether it had a wonderful performance." The one thing Tuck got out of the Farnborough trials was the ability to put himself inside the enemy's cockpit.'