What was the hallmark of British foreign policy in the 19th century?

The main task of England in the foreign policy arena in the 19th century was to prevent the strengthening of one of the European powers. Russia, Prussia, Austria were some of the potential enemies (or allies) for England. England strove to maintain the status quo and prevent shocks.

Also, England was actively expanding its overseas possessions (for example, India). This was due to the fact that England needed resources for its economy. England is considered the first colonial power in the world.