What is Britain? Red, red, red. Guardsmen in tunics, double-decker buses, ginger people, especially in Scotland, and Royal Mail letter boxes.
We Brits are renowned for being eccentric. There is even a society/Verein for people who have an interest in letter boxes, with all their different shapes and sizes, cyphers, etc, etc. The society even has a photo gallery to satisfy letter box fans.
Remember, if you find this all strange, Britain is also the home of train-spotters.
Personally my favourite is at High Ellington in the Yorkshire Dales, sadly not shown in the gallery. Enjoy the pictures. http://www.lbsg.org/