Well during the WW II they have dedicated ASW corvette to guard convoy thru atlantic crossing. They are small so they can dart between the ship in formation 1000 ton about the same tonnage as Type56. So I wouldn't foreclose type 56 as ASW screen for SAG
They were successful design
In early 1939, with the risk of war with
increasing, it was clear to the Royal Navy that it needed more escort ships to counter the threat from
. One particular concern was the need to protect shipping off the east coast of Britain. What was needed was something larger and faster than
, but still cheap enough to be built in large numbers, preferably at small merchant shipyards, as larger yards were already busy.
To meet this requirement, the
of
, a specialist in the design and build of fishing vessels, offered a development of its 700-ton, 16 knots (18 mph; 30 km/h)
(whale catcher)
.
They were intended as small convoy escort ships that could be produced quickly and cheaply in large numbers.
Despite naval planners' intentions that they be deployed for coastal convoys, their long range meant that they became the mainstay of convoy protection during the first half of the war.
Operations
Flower-class corvettes were used extensively by both the RN and RCN in the war-long
. They also saw limited service elsewhere with the RN, as well as the USN and several Allied navies such as the Royal Netherlands Navy, the Royal Norwegian Navy, the Royal Hellenic Navy, the Free French Naval Forces, the Royal Indian Navy, and the Royal New Zealand Navy. The
used some of these vessels during World War II, and have continued to use Flower names for
to this day.