That was my thought. I've never had a full English on account of being in Norn Iron but my experience with takeaway fryups of which I have quite a bit is that it comes in a styrofoam container.
There was a kebab/burger/chicken/curry/whatever-else place near where I once lived in the East End in London that did fryups on cardboard plates wrapped in foil. Used to find them all around the parks when I’d take my dog on walks. Nestled in with all the CO cartridges in the bushes and along the kerb.
One time, I had “pie and mash” in Greenwich (pronounced “Grinnich” innit bruv) village. It was the blandest shit I’ve ever tasted. For all the pillaging and conquest the English have committed over the centuries, you’d think their food would taste better.
If you want tasty spoils of empire, try a curry or Chinese. There's a reason "pie and mash" is only served in London, it's because the rest of the country wouldn't stand for it.