For a while I wondered what these benches were all about:
They appear at a number of London and South-East railway stations, and when I first saw them I thought they were a bizarre and out of keeping design decision. Why choose something in such bright, primary-ish colours against a generally muted design scheme. They wouldn’t be out of keeping somewhere—but, not here! And after a couple of years it suddenly struck me—they are the olympic rings, that hung up at St. Pancras during the games, sliced and turned into benches! My supposition is confirmed by Londonist here.