Ferry service on the Thames is an ancient line of work. Today, there is an armada of ferries that go back and forth. They often have guided tours on the outbound trips, towards to sea. The ferry service flags have a logo similar to the London Underground or subway service. But for the ferry is has cyan circle on a field of gray with the central horizontal bar with the word 'RIVER' written across.
You can see the famous Cutty Sark in the background, which also has a fine spirit for its namesake. Additionally you can see a tiny Union Flag on top of the little orange and yellow striped play-light house.