Thanks to everyone who's posted so far!

Looks like VKA is in the lead. I need to find out what the proportions are for the general population.

It seems like many people agree that although they practice RCs they don't find themselves doing them in dreams - its just a general awareness of something dreamlike. I don't know how significant this is in terms of how we teach people LDing? I wonder if there are techniques for improving general awareness that work to increase this dream awareness? I've been trying a few - but my ideas are still gestating...

Then there's the Tibetan advice to declare all as a dream!