As mentioned before, most ATC units in Europe (my experience) handle the 757 as 'medium' when following, and as 'heavy' when preceeding.
On the other hand, I made the same experience as Pimp My Ride in LHR, so we always tell ATC that we need 2 mins seperation behind the departing 757 in front. That was never a problem, just have to tell ATC well in advance to keep them in the loop.
Regards
Last edited by DBate; 11th August 2008 at 14:01.
Reason: Edited for misspelling