For a less formal Gordon Ramsay experience in London, I recommend The Narrow (newish restaurant and bar) in the eastern part along the water with interesting views. It has a glassed in room looking toward the water as well as an outdoor deck. Fish and seafood are emphasized but there's a varied menu. When I was there, a number of the staff, some of whom came from his other restaurants, were talking about Gordon Ramsay being very involved when they first opened; they all seemed to have met him, even the bus persons. It's a nicer setting in the summer and one would ideally arrive in daylight and enjoy the sunset there. The building has the feel of a traditional summer house along the beach.