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Why did they not demand a retro fit of inertia weights to the MK I & II that would have been in the OTU squadrons at the time if it was such a problem?
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I know it was later modified with an inertial elevator. They did something to correct it, you can bet.
The fact remains, the RAE skirted around the problem because they had no real estabilished foundation for what to do with longitudinal instability.
Especially when the pilot's opinion ran contrary.
It is really interesting if you like the history of technological development. There was a guy in England who laid down all the math just before World War I. It was in center of pressure and metacenter so his mechanics were not completely correct but all his principles were as well as the use of polynomial co-efficients to describe motion. Professor GH Bryan's really cracked the nut on stability and control.
Some of his conclusion's are used today.
The problem was when he tried to explain it, it was so complicated that most engineer's eye glazed over, mouths came open, and the drooling begain. Then, some pilot would hop in the same plane his big complicated set of equations had predicted was unstable and fly off in it.
You can control an airplane that is unstable, especially the long period oscillation the NPL became focused on. The 1903 Wright Flyer was so unstable, the techique used to land it was to fly close to the ground at low velocity and let the skids touch on the downward oscillation.
You could not estabilish a stabilized approach that is common in todays airplanes.
They flew extremely unstable aircraft all the time in the early days of aviation. The velocity and forces were low enough that stability and control just was not that important.
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the major flight characteristic ever present is the feeling that if you took your hands off the stick or your feet off of the rudders, the Eindecker would turn itself inside out or literally swap ends." He also indicates that the all-moving surfaces continually hunted back and forth with an attendant feedback into the pilot's hands and feet. These characteristics describe an aircraft that by modern standards would be considered unpleasant to fly, would be unlicensable, and certainly would inspire little confidence in the mind of the pilot.
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http://www.hq.nasa.gov/pao/History/SP-468/ch2-2.htm
That all changed with the advent in the powerful monoplane fighters of World War II. The speed and forces involved pushed the science of stability and control to the forefront.