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From top left, David Jason, David Janssen, David Niven, David Janson, David McCallum, and David Lodge.
David Janson best known for the postman in Keeping up with Appearances
David Janson, David Jason, David Lodge, David McCallum, David Niven, and David Jensson.
David Jason, David Jansen, David Niven, (can't think of his name), David Macallum, David Janson.
David Jason, David Janssen, David Niven, David McCallum, David Janson - not sure on last one.