In reply to Horse:
Yes, I know, and it does sometimes cause confusion with summer/winter ML. And of course, to add to the confusion, going scrambling in December is quite likely to be a 'summer' activity.
But 'Mountain Instructor (multipitch rock climbing and scrambling)' is a bit of a mouthful, don't you think? And it doesn't make it clear that they'll also have a summer ML, should you just want to go for a walk!
Hmmm. Not that the difference between a 'Mountain Leader' and a 'Mountain Instructor' is particularly clear if you don't know the system. And they don't do what they say. I mean, I've never managed to lead a mountain anywhere, summer or winter, and I've yet to meet a MIA who's taught a mountain anything useful......