The little trim plate is a pressed sheet. I have seen some modern repops that are made from billet.
I saw them on an e-bay listing as being from BMC, Jaguar XK, MK2, E Type, Daimler V8,Aston Martin, Jaguar MK 1 and MK 2's up to the end of March 1965, the similar Daimler V8 cars, the early Jaguar E Types, Aston Martins, MG Magnette, Wolseley and Riley saloons. Try plugging all that into a search.