And perhaps they should be, since they have been around for quite the while. Perhaps the best-known is the Austin FX4, which was made from 1958 to 1994.
They also have a reputation for being all-black, but they do come in many colours. In fact, there are no rules and/or regulations requiring any of them to be black. They can also carry five passengers in comfort, and can turn on a dime.
They had diesel engines of various sizes and makers, though a gasoline engine was available starting in 1962. Automatics were standard from Day One, but manuals became an option later. Why? I have no idea. I mean... a manual tranny in London???