If you happen to be looking for a great gastronomique stop in London, I invite you to go to the Ambassade de l’Ile in Kensington. The restaurant is the sister of l’Auberge de l’Ile in Lyon (hence the connection with me since this is where I was born). The place is very nice and the food was top notch for the price. Count on spending some money still (may be 100 pounds/person) but really the food is worth every penny of it.
Link to the web site of L’Ambassade de l’ile: http://www.aubergedelile.com/