Originally Posted by
chris63
Yes, you do need the PA to take you to the arrival fast track immigration point, because they keep moving it

Yes, but would that mean the PA now, with the new S terminal arrival, goes with you on the train and then walks with you to that point? As DelTroon mentioned, I wouldn't see much benefit of that other than perhaps it's a bit easier to find the right arrival fast track immigration with a PA. Before the direct buggy from plane to immigration was really convenient.