Just had a look on Auto Trader and there’s 6 cars on there described as “Launch Editions”.
One is a 13 plate car and doesn’t have the radar as described above, so probably one of the earliest.
But, the other 5 have the radar and there’s two 15 plates, two 16 plates and a 65 plate - so they’re not early ones and definitely before the facelift. So the theory of a facelift launch car seems to be wrong.
A bit of Googling brings up a fair few references to Launch Edition, but nothing that explains what it actually is! 🤷♂️