I will have to ask my Farther as he was one of the many who worked on the M3 construction in and around the Farnborough area. We lived in Farnborough at the time and left there in 1984.

Mark

When I worked on “Aviation News” in 1972/73 I recall we carried a small report that an engine and other parts had been discovered during road-building work (possibly for the then-new M3) in the Farnborough area.