A very brief history.
TVR M-Series made its public debut at the 1971 Earl’s Court Motor Show. A new, longer two seater fixed head coupé body was evident but the key innovation was the new chassis.
Three engine versions were available initially for the M-Series: the 1600M (Ford Kent 1.6 litre), the 2500M (Triumph 2.5 litre) and the 3000M (Ford Essex 3 litre). In September 1975 a Broadspeed turbo-charged version of the 3 litre engine became available and a total of 63 M-Series Turbos were ultimately built. In 1976 a hatchback version, the Taimar, was launched and in 1978 the convertible 3000S appeared.
M-Series production was discontinued at the end of 1979 to make way for the new Tasmin. Approximately 2500 M-Series cars had been built.
source: tvr-m.com