From "The BMAA 1986 & 87."

Controversy arose over the unregulated sub 70kg category, which the BMAA was
keen to maintain to provide low-cost, low-performance machines for those not
looking to use more expensive two-seaters having once obtained their flying
licence. The CAA was to review the position after a special interest group
devised necessary quality controls. However through his own involvement with
Mainair's production of sub-70kg machines group member John Hudson wrote to the
CAA about the inability of anyone to build a safe machine within this category
where so much emphasis was put on weight reduction, instigating a full CAA
investigation. Flight Line and the Newsletter became full of debate on this
issue. Later in the year members learnt that the sub-70 kg exemption was to be
withdrawn.


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