Announced at the 1963 Earls Court Motor Show,[1] only 26 were built, due to poor sales, in spite of its performance.

The equipment may have varied between cars, but were typically mechanically similar to a Morgan +4 of the same year.

It also shared the suspension with the +4: In front, it had sliding king pins tilted 17 degrees from the vertical, a development of Morgan's original, 1910 design.

The closed envelope two seat body was thin streamlined fibreglass with fixed top and all glass windows, wind-ups on the sides, giving it a weight of 1800 pounds (816 kg) and a top speed of around 115 mph (185 km/h) (compared to 111 mph (179 km/h) for the heavier, less streamlined TR4A).

Performance was better than +4, because the fibreglass kept the weight low in spite of more interior space, and the more modern shape had less air drag.