Originally Posted by
Asturias56
"Corvettes" have become a forgotten species in the UK - in general the need for more space for crew and advanced systems has led to funds being spent at the top end of the range - most modern frigates are bigger than destroyers in the past and a modern destroyer is bigger than a WW2 Cruiser. Freidmanns "British Destroyers" is very illuminating.
Of course the RN have the River Class - which really were originally bought to keep certain yards open rather than to fit any specific requirement but they've proved invaluable for low intensity work.
More that Corvette and Sloop were considered obsolete terms post-WWII and they were reclassified as frigates (Sloop had gone in theory but not practice in 1937). The River Class displacement is roughly double that of WWII Cs and Ss but unlike the Rivers they had substantial armament e.g. 4-inch guns, modern corvettes tend to have ASM and sometimes SAM fit also the capability (as do the River's) of carrying but not hangaring a helicopter though some have foldable hangars. In respect of sloops, my late father did not have fond memories of the impossibility of staying warm while keeping watch on a sloop's open bridge north of the Arctic Circle and trying to find U-boats to sink.
There was a modern sloop class proposed to fill part of the global combat ship requirement but it was rejected.