Alpha
The Bristol Aeroplane Plastics "Alpha" dinghy, built in the 1960s at Filton, is an early example of the use of fibreglass/resin construction for sailing boats. It was used for many years in the "Pegasus" sailing club run by and for BAC employees. Alphas were also made by Bossoms and Bourne & Co.
The Alpha resembles a Firefly, although many had a massive rubber moulding at the point of the bow in case you ran into anything.