Alvis changea son image en 1956 et habilla ses modèles de carrosseries plus modernes du suisse, Graber. Graber avait déjà travaillé pour d'autres firmes anglaises, notamment en habillant la Bentley Mk VI. La nouvelle Alvis paraissait lisse, distinguée et moderne, les carrosseries furent construites sous licence par Willowbrook.
   En 1958 la TA108G fut remplacée par la nouvelle mais similaire TD21 qui fut dessinnée par Park Ward de Rolls-Royce et Bentley. La nouvelle TD21 avait une plus belle ligne et un moteur de 120ch. En 1962 la TD21 Mk II arriva avec des phares intégrés et 4 freins à disques.
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   Alvis ditched its staid, old fashioned image in 1956 and clothed its new model with modern coachwork styled by Swiss coachbuilder, Graber. Graber bodies had already been used on other British models such as the Bentley Mk VI to great effect. The new Alvis looked sleek, distinguished and modern, the bodies were built under licence by a Loughborough based company called Willowbrook.
   In 1958 the TA108G was superseded by the new (and similar) TD21 model which had a body built by Park Ward of Rolls-Royce and Bentley fame. The new TD21 had better trim and an up-rated 120bhp engine. In 1962 the TD21 gained Mk II status and came with built-in fog lamps and all-round disc brakes. Production of the TD21 Mk II continued until 1963.
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