A larger Royal Navy sloop program before 1939

Could Britain have started a useful sloop program in 1934?

Yes. A sustained program could have added about fifty modern escorts by 1939, provided planners balanced ocean-going and inshore needs.

The proposed scale is about twelve sloops annually alongside destroyer construction, far above the historical output. The difficulty is not whether extra escorts would help, but balancing smaller inshore vessels against ocean-going types for distinct missions. A mixed program of eight of each type each year offers one plausible force-structure answer. Sustained from 1934, that policy would give Britain a much deeper modern escort reserve when the Atlantic war began.