Space Blues gave in-form jockey William Buick a Group One triumph in the Prix Maurice de Gheest at Deauville.
The 4-1 shot, trained in Newmarket for the Godolphin team by Charlie Appleby, was an impressive winner in France.
Another British runner, 14-1 shot Hello Youmzain from the Kevin Ryan yard, was second.
Aidan O'Brien's fast-finishing Irish challenger Lope Y Fernandez (10-1) finished third.
Godolphin's previously unbeaten favourite Earthlight, trained in France by Andre Fabre, was unplaced when seeking a seventh straight success.