[QUOTE] Considering that Heathrow is (one of ?) the busiest airports in the world, I'm not surprised that they're being cautious. I'm surprised that there has never been a major incident in the airport. [/QUOTE] They're being standard, tbh. This is ATC practice. The problem is that LHR is at capacity. Heathrow is the busiest international airport in the world. Probably the busiest once T5 goes live. But, there is a UK one that becomes the busiest in the world overall for a very short time each year. O'Hare, as I am sure we all know, is the busiest in terms of pax. Atlanta Peachtree (hellhole) has the most movements, iirc. Ali