Not much of a contribution here. I noted that 2 stars need be
the 'reference index' for this film, and that it currently has '?'.

I've seen this film; and, for near a decade, owned an identical vehicle, hence my interest being somewhat personalized.

The climax in 'Suspicion' involves approximately a 60-second constant
scene of Cary Grant driving in anger, much time of the shot focused,
oddly, on his view of the instrument panel. This Lagonda model was the
fastest [one of the fastest!] vehicles available in the world at the time.

Director Hitchcock was a devoted car enthusiast, featuring interesting cars
often. Lagonda was purchased in the mid-1930's, then sold after the war into
the David Brown organization, combined to making up Aston Martin-Lagonda in the 1940's.

James Bond of course drove DB's forever, to this day. The models' name being a reference to Sir David Brown, one of Englands' greatest industrialists
in the 20th century.

Today's recently introduced AML 'Rapide' four-door saloon takes its' name
from Lagonda's legacy, one of the most beautiful pre-war cars: the Lagonda LG 45 Rapide, a W.O. Bentley masterpiece when he was Engineering director for Lagonda.