Iron Shipwright makes one in 1:350 scale resin & brass
http://www.commanderseries.com/ships_350.html
WSW or DocModell used to make one in 1:700 scale resin only. You'll need to suply your own aftermarket brass details. I wasn't able to locate a current listing.
Mirage, Airfix, Revell, and Combat Models all make plastic four-pipe destroyer kits which will need to be modified to represent HMS Campbeltown. These will need to be completed to your desired level of detail with aftermarket brass. (hint - stay away from the Combat Models kit)