My mate went to the "secret" Skreamzim rave thing, it was through a door by one of the other stages in Shangri-La apparently, massive queue so you couldn't miss it (his words, I wasn't there) think he queued for about 30 mins, spent an hour in there (it was a long thin room, looked like the inside of a few shipping containers) he said it was rammed and hot and nobody had painted their faces (he had)