There were exceptions, but new designs essentially did not appear in America until the 1948 and (especially) 1949 model years.
General Motors' British subsidiary Vauxhall did not introduce new designs until mid-1951. It made do with a major facelift for 1948. The Wikipedia entry for Vauxhall is here. Scroll down to "1940s" for some background for today's post.
I find it interesting that GM used unit-bodies for its mainline Vauxhall models starting in 1937. (It didn't introduce unit bodies on its American lines until 1960's Chevrolet Corvair.) So the 1948 facelift and renaming of its models had to deal with a body structure that was expensive to greatly modify.
Details are in the Gallery captions below.
Pre-war Vauxhall Unitized Body - General Motors image
This is what Vauxhall stylists and body engineers had to work with.
c.1946 Vauxhall Twelve-Four - car-for-sale photo
Warmed-over prewar design. The most obvious change is its grill bars are oriented horizontally rather than vertically. Wheelbase is 101.25 inches (2572 mm).
1949 Vauxhall Wyvern - car-for-sale photo
Its replacement model. It and the Velox have a 97.75 inch (2483 mm) wheelbase, as did prewar Ten-Four models. The Wyvern's doors and A- and B-pillars are the same, indicating that much of the basic unitary body was retained. Note that the forward curve lines of the rear fenders are the same in both designs. Otherwise, fenders are more "suitcase" style, as seen on 1941-vintage cars from several American carmakers.
c.1946 Vauxhall Twelve-Four - car-for-sale photo
Front quarter view. Note the windshield.
1950 Vauxhall Velox L-Type - car-for-sale photo
It was retained in the facelift for structural reasons. What's changed is forward of the cowling/A-pillar. The new design is in the spirit of circa-1942 American styling. The result is a car seeming different, not really English, but more "modern."
c.1946 Vauxhall Twelve-Four - car-for-sale photo
Rear-quarter. Very 1930s.
1950 Vauxhall Velox L-Type - car-for-sale photo
The aft part of the passenger compartment unibody structure was altered to create this more rounded shape. The trunk (boot) is greatly enlarged. The spare tire is now stored under the trunk's floor: note the access panel above the bumper. Also changed is the backlight window.
1939 Vauxhall Ten-Four - car-for-sale photo
To tidy things up, before-and-after side views of cars with the same 97.75-inch wheelbase.
1951 Vauxhall Velox L-Type - car-for-sale photo
The changes resulted in a much more up-to-date (for the late '40s) profile.

















































