It was a revised version of the TC 108G, the body was made by Park Ward who were better able to supply them to the quantity, quality, and price required.

The 2993 cc engine was again uprated, now producing 115 bhp (86 kW)[2] mainly by an improved cylinder head and increasing the compression ratio from 8.0:1 to 8.5:1.

[4] In April 1962 the car was upgraded with four wheel Dunlop disc brakes in place of the disc/drum combination and named Series II.

[1] The previously stand-alone fog lamps were built into the front of the car, recessed in the middle of new circular air intakes, one for the heater, the other for the carburettors.

A Series II Alvis TD21 features heavily throughout the historical crime novel set in 1973 The Nicholas Duncan Mysteries : Everyday by Stuart Tidman (2022, ISBN 978-1-80074-321-2 ), as the vehicle of choice of the afore-named lead character, a Detective Sergeant in the Coventry Police.