FILE - In this Oct. 19, 1972 file photo, European leaders pose for a photograph, at the European Common Market summit conference, with French President Georges Pompidou fourth from right stands next to Britain's Prime Minister Edward Heath, third from right, at an Elysee Palace luncheon, in Paris. Britain finally joined the "common market' at the start of 1973 after Heath managed to douse concerns in Europe. Britain’s cause was helped by the resignation of French President Charles de Gaulle in 1969. His successor Pompidou proved far more amenable to Britain’s membership. (AP Photo/Michel Lipchitz, File)