Note, the hotfixes for Revolutions (see my sig) reduce the Badboy that comes upon Germany via unification from Three Hurrahs.
As for the British, actually they were nervous about Bismarck, but they realized there was little they could do to reverse it, especially given the speed of the Prussian victories in 1866 and 1870. Britain was a great sea power, but its land forces were, to put it mildly, middling. Bismarck himself quipped, when asked what he'd do if the British made a landing on the northern coast of Prussia, remarked something to the affect of sending the local police corps of the area out to arrest them, which gives you the idea of what he thought of British landpower capabilities.
And of course, in 1870 it was the French who declared war first, so any argument that a British intervention would help retain the balance of power in Europe were harder to make, since it appeared it was Napoleon III who was the aggressor, not Bismarck. And few in Europe completely trusted Nap3 after nearly two decades of French adventurism in Europe and overseas.
