1899 - 1958
Principal of the design studio responsible for the super Castrol adverts of the 1920's onwards. In some cases (rarely) the advert is signed either in full with date (see Campbell advert Motor Sport magazine March 1933) or just a monogram WT. It could be assumed that the signed adverts are by Trevithick himself. A whole archive of the original artwork was sold by Sotheby's in 1996.
Adverts featuring things that easily move in frozen conditions
Knight and oil can
Castrol success of Eyston diesel car
Label often found on reverse of Castrol artwork
Trevithick WT on some artwork