I've taken the chance and uploaded my licence as I have seen a few M's filtering through to other Tesla orders (according to other forums). If I get assigned an L VIN, I'll phone up the SA and delay a bit longer. Fingers crossed though I'll get assigned an early M though now. The main reason for the M hold out is the Tesla power trunk and I was going to de-chrome too.
Hope I haven't jumped in too early.
For those who have experience in turning down an assigned VIN, I assume it's pretty straightforward and I can easily do up until I have paid for the car?