The two-power standard as insurance against France and Russia

Were other powers plotting against Britain when it adopted the two-power standard?

Not as a coordinated plot; Britain was hedging against French and Russian diplomacy and preserving the maritime control needed to sustain India against a Russian advance.

British planners watched two rival empires whose cooperation could create a dangerous strategic combination. Their calculation was that a Russian attack on India could be defeated if the Royal Navy contained French interference, moved British reinforcements and supplies by sea, and restricted manufactured imports to Russia. India had a local support base, while a Russian army would be operating at the far end of a long land route. The two-power standard functioned as insurance against a possible combination, without requiring an existing Franco-Russian plan for war.