How more British sloops could have changed the U-boat war

What if Britain had mass-produced sloops before the Second World War?

Germany's small initial U-boat arm would face heavier early losses, weakening both operations and the trained-personnel base needed for expansion.

Germany began the war with roughly sixty U-boats, so early losses would remove experienced crews as well as hulls. Those crews also formed the foundation for training replacements and expanding the arm, which gives each early sinking a compounding effect. Extra sloops would widen convoy coverage and support more active hunting. The counterfactual scales from 36 additional ships to 72 and then 180, with the result moving from a large effect to a potentially decisive one as the escort force grows.