As a comparison, when Greece had the games in 2004, they simply screwed their GA. No VFR flights at all within the relevant area. But IFR was apparently allowed, which is why I don't understand why they don't allow IFR within the RA (by IFR I mean flight planned airways IFR, under London Control). I assume that airway sections passing through the RA will be locked out via IFPS in this case. Not that that would help GA and flying schools which are mostly VFR-only.