I recently found these at the back of my filing cabinet. Pity I'll probably never be able to use them. (The UK government changed our car stickers to "UK" a couple of years ago, for no good reason.)

"Sealink Stena Line" was the brand used by cross channel ferries from 1984. It changed to "Stena Sealink Line" a few years later. These stickers are ~40 years old!