Thread about Supermarine Scimitar in What If Modellers:
https://www.alternatehistory.com/forum/ ... ar.375942/
http://www.britmodeller.com/forums/inde ... imitar-f1/
As it seems from third link, Scimitar was not designed with area rule and had straight fuselage. Moreover, it had thick wings. Because of these Scimitar was not supersonic. Probably a Avon 301/302 without reheater, good for 12,600 lbf was bolt on engine or an RB.106 without reheat again (14,000 lbf of thrust says in first link). Enlarged intakes would give it some area rule fuselage and with a modified thinner wings could probably reach mach 1.4, or 1,2 with original wings (its absolute speed in dive). I do not know if 1,2 machine is the design limit speed however. Think that some design of a thin wing Scimitar did exist. If J.Mitchell lived more, probably the aircraft for the OR which led to creation of Scimitar would need different. We will never know.
The question is if Supermarine Scimitar could be improved, in lets say Scimitar Mk2 follow on.
P.S Scimitar and Sea Vixen are my favorite Fleet Air Arm aircraft from 1950's.