British objectives without a formal Confederate alliance

Would Britain openly ally with the Confederacy in a Trent Affair war?

A formal alliance and British land intervention are unlikely, but British convoy and blockade-breaking activity could materially help the Confederacy and defend Canada.

British troops would probably remain apart from Confederate armies, without a rigid alliance built around Southern war aims. Britain could protect merchant convoys, use Confederate harbours as bases, and weaken the Union blockade while concentrating its army on Canada. That assistance would restore trade and, more importantly, the coastal movement of Confederate troops and supplies. Southern railways and rivers generally connected the interior to the coast more effectively than they connected one theatre laterally to another. Reopening sea movement would keep Confederate armies active and reduce the pressure on Canada. The analogy is Britain’s wartime cooperation with Stalin and its support for continental allies against Napoleon: expediency during a war did not require approval of a partner’s regime.