Was it a VOSA recorded delivery recall? If not - I wouldn't worry. Would be interested in what they do to it, however - for the greater good and all that.
Silver 08 plate 5dr 1.5dci Dynamique 106 Tech Run (re-mapped)
Red 03 plate 5dr 1.9 Dynamique dci120
Best advice for Megane owners: sell it before it bankrupts you!
I called Renault yesterday and they said it is just to check if it has any issues with the software and if so to then program it. Nothing to worry about apparently.