The England striker headed his side in front with just four minutes gone, and then converted a 45th-minute penalty after Danny Higginbotham had been penalised for handball.
Obafemi Martins could have wrapped up the win with 22 minutes remaining, but saw his effort blocked by Craig Gordon, and Steve Harper had to make a fine save from Kenwyne Jones seconds later to deny the visitors a way back into the game.
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