I always wondered, why in Victorian age the various British governments not only closed an eye towards the rise of Napoleon III but also cooperate with France in several occasions (Crimea and Mexico as the most renown ones, but I can think of the French intervention in Italy of '59 as well as greenlighted by London and so on)? Thirty years were more than sufficient for the British to change aptitude towards that kind of France? They were so smitten in their policy of isolation towards Europe and focusing over overseas empire building? Or else?