I suffered the same issue with Immigration on Monday night around 2330. We were held prior to Immigration for 10 mins because the Immigration area was too busy. Once allowed through the Immigration area prior to baggage reclaim was hell! A sea of thousands of people it took forever to get through. The fact that every based FR plane lands back between 2300-0000 doesn't help (40 plane loads = 7500 people) not forgetting any other arrival.
