I've tried waving at a variety of Land Rover vehicles since I've got my RRC, but have felt a bit of a spanner as not one has waved back. Maybe it's an Edinburgh thing.
When I had my Alfa 147 GTA I got loads of waves, light flashes and thumbs up from other Alfas, and also from other Italian cars like Ferraris and Lambos. Subaru driver's too. That was a great car.
One of my best memories was getting a thumbs up from a then just out Ferrari F430 driver whilst sat at traffic lights on a warm summer's evening [on a private road]. We both floored it away from the lights - a great memory.