Never thought I would post on Sea Jet but here goes.
T23 has no decent CIWS. Just Vert SeaWolf 30mm and minguns.
Type 42s had the hastily fitted 20mm Phalanx post the Falklands, where if they had been fitted before we wouldn't have lost Coventry or Sheffield. Would the Malvinas invasion force have tried to bomb ships with the 20mm buzz saw coming at them? I think not.
Type 22's are probably the best defended ship in the fleet with 30mm Goalkeeper, 30mm cannon and min guns.
However I would rather have a couple of fighters above me running a CAP.
WEBF if I were you, I would join the submarine service, you can't kill what you can't see.