Mystro spends a lot of time in Oz so it wouldn't surprise me that he is known over there....plus he has an insane amount of skill.
I think this is a great time for UK rap and artist crossing over to have mainstream success...however the sound that is being produce is VERY mainstream and dance/club orientated. A lot of artist would have to sacrifice their roots to achieve success. I mean how many of the British grime/hip hop acts could have had the success they are having now if they came out originally with what they are releasing now... I'm not knocking it at all but I'm not sure of the longevity of it all. But I guess that is where you adapt your style to the ever changing market