It was a delight to see that Max Graham, son of Jonny Graham, had started a proper Bar for good Portuguese food in the City. His father Jonny set up Churchill Port in the 1970s when Graham’s Port, the family business, was acquired by their close associates in the Douro, the Symington family who also own, amongst others, Dows Port and Warres. The ideal aperitif and refreshing drink when it’s hot, like it often is in the Douro, is chilled white Port and tonic, often with a sprig of mint. Quite…