Air-cooled, 500cc two-stroke, motocross and enduro bikes. Built in Herefordshire, England in the early 1980's by the Wilcox brothers.
Innovative in their day, featuring single-shock with remote reservoir mounted on the swingarm. Front hub and disc is one unit, cast out of Magnesium, with the disc hard-chromed, and the wheels were built locally in Ross-on-Wye (possibly by Gordon Lucas). The engine was lightly based on the YZ465 lump and is well-engineered, with what looks like a provision for a power-valve cast into the barrel. The reed block itself is huge, with eight sets of petals!
From what I've heard, it was let down by an overheating rear shock, but information is scarce. If you know more, please get in touch.