Delta aerodynamics was booty from Germany, disseminated by RAE, NACA/US, ONÉRA/France. M.Dassault taunted: “If it were not for the clumsy way (UK) tackle things, you could have made (it.)” J.Gee, Mirage, 1971, MacDonald: he alluded to FD.2, flown 10/54, seen at Cazaux 10/56, departing 2 days before rollout of Mirage III No.1 prototype.
UK flew FD.2 supersonically from sunny SW France, because that was less painful than over the Irish Sea. AMD crawled all over it...but nothing was unknown to them because NATO Allies exchanged basic data. Convair had Lippisch, XF-92A flown 9/48, leading to F-102/106. AMD first schemed delta Mysteres c.1951: M.D.550, flown 6/55, and (schemed) Mirage II had rocket-boost. It was the availability of SNECMA ATAR that made Mirage III what it became.
So, let's settle for: FD.2 as a paper project modestly, slowly funded 1950-52, may have encouraged the design direction taken towards Mirage III.