The BML fairing on my 500 Bullet is a 1962 Sportsman with 21" perspex screen. As it was not designed for the Bullet I had to change the fittings and make a bypass for the exhaust pipe. The interior with the hand glove pockets is missing as are the original fittings.
It took a while for me to find any info regarding this fairing, but now the internet gave away its secret: BML stood for Butlers Moulding Ltd, located at Hollands Road Haverhill Suffolk England. Besides a maker of glasfiber parts for motorcycles, complete bikes and later on glasfiber sailing boats and yachts he was a well known trial racer at the time as you can read in this part of his autobiography below.

Chris Butler (autobiography):

In 1954 I learned of a new material, Glassfibre Reinforced Plastics (GRP). It was discovered just before the war but was still a very new raw material. I experimented and applied it to manufacturing motorcycle accessories. Since I was fourteen I had been hyper-actively keen on motorcycles and motorcycle sport. Until I retired after twenty years from the sport of cross- country motorcycle racing owing to just too many injuries to my right knee, I had become fairly well known as an international rider, though well below world championship standard; however, I could claim close friendship with many champions by the end of my riding career, including the making of special components for their competition and racing motorcycles.

By 1957 we had developed our small business based on GRP and moved from our marriage home in Cheshunt, Hants, back to the East End in Hackney; living above the shop and factory. In time, needing more factory space, we moved to Haverhill in Suffolk. Whilst there I designed and built some 200 specialist motorcycles, and after retiring from motorcycle sport in 1968 took to building racing sailing dinghies including the Olympic Finn, the 505, Cadet, and later, small 'cruiser-racer' sailing yachts.

The year was 1966 and I was still riding my motorcycles and continued to do so for another two years before concluding I was no longer "up to it" in 1968 at 36 years old.
My reactions were slowing down and I was getting dangerous.

Our fibreglass moulding business had been based on making motorcycle accessories but had expanded into making complete motorcycles, mostly with Villiers 250 engines until the supply dried up.
Some of these still perform today (2008) 45 years on - and I am pleased that those bikes still have a collectors value, still look good and are competitive to this day.

Butler-fiberglass-bodyguards-Cycle-April-1966-ad Cycle April 1966
Cycle April 1966
Butler-fiberglass-bodyguards-Cycle-May-1966-ad Cycle May 1966
Cycle May 1966
Butler_fiberglass_bodyguards_CycleNov1966-ad Cycle November 1966
Cycle November 1966
Butler-ISDT-Triumph Butler ISDT Triumph
Butler ISDT Triumph
Butler-Tempest-01 Butler Tempest
Butler Tempest
Butler-Tempest-02 Butler Tempest
Butler Tempest
Butler-Tempest-03-frame Butler Tempest
Butler Tempest
Butler-Trials-Villiers-250 Butler Tempest
Butler Tempest
1962-Butler-Catalogue-fairings-01 1962 Butler Catalogue
1962 Butler Catalogue
1962-Butler-Catalogue-fairings-01a 1962 Butler Catalogue
1962 Butler Catalogue
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1962 Butler Catalogue
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1962 Butler Catalogue
1962-Butler-Catalogue-fairings-04 1962 Butler Catalogue
1962 Butler Catalogue
1962-Butler-Catalogue-fairings-05 1962 Butler Catalogue
1962 Butler Catalogue
1962-Butler-Catalogue-fairings-06 1962 Butler Catalogue
1962 Butler Catalogue
1962-Butler-Catalogue-fairings-07 1962 Butler Catalogue
1962 Butler Catalogue