What if Napoleon III Did Not Betray Italy?

REALLY late post, sorry.

Ok, so lets go back earlier to talking about the Schleswig-Holstein question as a POD. What specific POD could get Britain/France to intervene in the war (from what you have said before I would assume if one intervened the other would follow). Or could it just be a POD on its own, Nappy or the British Prime Minister decides to protect Denmark?
 
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