At the end of the Napoleonic wars France was defeated and Britain was the only great power left with a large naval force, it seems like a perfect opportunity to seize the colonies of their rival. Places like the French antilles, their outposts in Africa, Pondichéry in India. But they didn't, in fact they even returned french colonies they had occupied during the war. Why so ? I doubt it was out of the goodness of their heart.
While you wait for an answer you might be interested in Rites of Peace by Adam Zamoyski its a detailed account of the Congress of Vienna. I read it so long ago I don't remember enough to give you an answer unfortunately. The book is an incredibly detailed account so if you want to know how many candles were made for one of the many balls held during the conference this is a great read.