3 wheel cars were for some time quite popular in the UK with the majority being made by a company called Reliant.

Reliant Regal

The most popular Reliant model was the Robin, it was first manufactured in 1973 and  production continued until 1981. In 1989 a new more powerfull Robin with more modern stlying was released with production continuing until Feburary 2001. The Robin made a brief comeback in 2002 when another company that licenced the designs from reliant started to produce the car again but due to verious problems the project only lasted a few months. 

A few reliants were made famous around the world in British TV shows, an earlier Reliant the Regal was used on TV shows like George and Mildred, Only fools and horses, and Mr Bean. Production of the Regal started around the mid 1950s and finished when the Robin was introduced in 1973.

The cars were made from fiberglass and started life with a 660cc motor later upgraded to 850cc. 3 wheelers were popular despite their odd looks and tendency to roll over when cornering as you only need a motorbike license to drive one making the car very cheap to own. 3 wheelers are frequently the butt of many automotive jokes, and the Reliant was no exception, it was often refered to as the plastic pig.