The never-built variants of the Westland Wyvern.
The first W.34 design in mid-1944 penned by W.E.W. Petter had the Rolls-Royce Eagle behind the cockpit for excellent landing visibility and it was slightly smaller than the TF.Mk.I as built. Top speed was estimated at 420mph, all-up weight 17,300lbs. There was brief RAF interest in an escort fighter version but in the end Spec the aircraft was developed to N.11/44 for the Navy. The desire to upgrade to turboprops was built into the design, probably one reason why the layout was altered to a more conventional engine-first layout.
The W.36 was a Wyvern with a jet-engine drawn up in 1946. It would have had either a Rolls-Royce AJ.65 (became the Avon) or a Metrovick F.9 axial-jet. The plan seems to show six cannon, two in the nose and four in the wings, the exhausts were planned as flush outlets but I think this would have been modified if built into a nib-pipe like the Sea Hawk. Oddly, this split tailpipe arrange would have allowed the retention of a tailwheel undercarriage, nothing on the plan indicates a nosewheel.
The S.Mk.5E was proposed in March 1954 with a Napier E.141 Double Eland turboprop with wingtip tanks.