The Gilbern name is a combination of its two founders, Giles Smith and Bernard Friese, and it was the only car manufacturer to originate in Wales. While it was in business, it managed to make the leap from kit-car to production vehicles, and do so by offering a series of smart and desirable two-door coupes. They were all built using the same production method of a glass fibre body over a steel tube chassis.
Early GTs were based on BMC mechanical parts, but over the years the company used more and more parts from Ford, starting with its V6 engines for the Genie and Invader models. By the Invader III all mechanical parts were stamped with the Ford logo. The energy crisis and VAT changes, (which upped the prices of kit cars) killed the company off in 1974, like so many other small specialist carmakers.