I was looking for flts jfk-zrh near Thanksgiving (AA 64 NS doesn't run), one routing gave me EXACTLY a 1 HOUR connection in LHR, this is supposed to be a legal connection, but I can't see it, I would have to clear security (even as a FAST TRACK pax) could take 30 minutes, throw in lots of walking and a train ride within T5, even if my inbound is on time, 1 hour is too short.
PS: If I go to Heathrows home page, they give me the connection steps, they note that I might even be able to visit a lounge to relax...they can't be serious