Duncan - I'm not actually convinced the Advan 050 Medium is a medium in the Dunlop sense if that makes sense. Guys are getting great wear rates out of them so I reckon they are just called a Medium in comparison to the A048's - which were HARD.
It's probably why that compund comes in Medium, Soft and Super Soft rather than Hard, Medium and Soft.
I'm going to give the A050's a crack next as I the reports I've had are that they are harder / longer lasting than the Dunlop R compounds despite being called a medium. Because given the medium is the hardest compound the tyre gets made in what is the reference point? It's all just marketing rather than a base figure probably.