OK - got it! Totally by random listening to some new twelves in Rough Trade, listened to this one thing and thought both tracks on one side were pretty horrible, almost didn't listen to the other side but thought I might as well... it sounded familiar and then it clicked!
Anyway, it's been built up massively so obviously it doesn't live up to the hype and it sounded better on a big system and and so forth (also could be a different version cos he had it on a pre-release white label) but if you wanna listen, here it is (apologies if anyone suggested it and I missed it), I still think it's a killer.
Was my description apt?