Grand Tour

Some time ago I came across an article on the internet claiming that a historian, whose name I've forgotten, said something interesting about the Grand Tour that offspring of the nobility used to engage in. Namely that the value of the Tour lay not so much in its content as in its usefulness in maintaining appearances of class difference.

Does anyone know which historian this might be? Maybe even in which book? (I have unfortunately forgotten and can't even find my way back to the article.)