The message
from djc contains these words:

Cresta, the last of the really ugly ones, (though thereafter was not a
great improvement). As a child c1960 I remember a really ugly one across
the road - Velox? - somehow the association of Vauxhall and ugly rust
heap persists in my mind to this day.

In the 50s and early 60s the Cresta was the deluxe edition of the Velox
and would have looked much the same externally. I don't know exactly
when then Velox name was dropped but it was probably somewhere around
1965.

--
Roger Chapman