We have traced five pilots of our JP Mk4 XS186, who flew her from Manby between 1964 and 1968.
Some of the anecdotes suggest the Mk4 was a bit too popular for it's own good, with very regular stories of aircraft exceeding G limits during manouveres which the 3's just would not do.
One pilot we are now in regular touch with was known for 'sky-writing' the M for Manby in XS186 as part of his solo display routine, and on more than one occasion stresseed the airframe beyond it's suggested limits by some margin. A bit before my time but apparently not uncommon in those halcyon days ..... probably explains why XS186 was retired in 1968 after just four years, a bit before most others, but probably because she was one of the first pair of Mk4's to be delivered to Manby (with XS209) and attracted a bit of attention when 3's had been the only fun before them ?