Nah! It'll be a 1/48th scale kit, probably either Hobby Boss or Academy. I remember buidling the Airfix 1/72nd scale kit around about 1964, when the moulds were still new. No fit problems then, but of course, we probably didn't know the difference in those days! Basically, if it looked like the subject being modelled, was reasonably accurate and the right size, that was good enough - anything else we'd add ourselves. How things have changed!
Come to think of it, I think I built another Airfix Mirage not long after the Falklands conflict, converting it to Argentine spec and painting it accordingly - one of the many models lost in house moves since then. The kit is nearly as old as the real thing!