That could actually be reason to support Germany as counter-weight against France. Just like they did in 7 years war with Prussia. Britain has a noble tradition of "divide and rule" politics both on geopolitical and local stage.
As I wrote, that is a possibility. But they might as well turn against such a German Empire if it threatens the balance of power in their view. Definitly would not have been an easy situation for any British government if something like that had happened.