Halo. .. .<<What if the landing isn't assured?? There is no such thing as a guaranteed landing at Heathrow. . .What about factors beyond the pilots control?? If he'd come all the way down the approach and for whatever reason one of us had sent him around, then what?? >>. .. .Our "Ops Manual" uses the very words "A landing is "assured" if,....". Were you to "send the aircraft around", and no PAN had been made to this point, the aircraft may now have just the 30 mins holding fuel aboard (to tanks DRY). The next radio call will be Mayday, and the aircraft will have the fuel to fly a visual circuit / tight radar circuit (a go around will use 10-15 mins "holding fuel" in 2-3 mins if you get my drift). An extended radar circuit, diversion or further go-around is not an option.... .. .NoD