During the Seven Years War, in 1761, William Pitt learned from his spies that Spain was going to join the war by mid-1762, and urged the King to declare war immediately.
In OTL, Bute blocked this, but what if he was out of the picture somehow? Would Britain have significantly benefitted from declaring war early, before Spain was prepared?
If Pitt hadn't had to resign over this, he would also have had more power to block the Peace of Paris and got his extra year of war. What would have been the impact of that?