Earlier at thread 40 someone asked if mixed mode operation at LHR would increase the movement rate. The rational being at LGW, mixed mode, when the w/x gets adverse, strong H/Ws or low vis. proceedures, they have less delays because the extra separation is partially built in. Clearly at LHR with the current tight separation and non mixed mode, everything goes pearshaped fairly quickly. I suspect the ground movement problems would be a nightmare and could lead to gridlock. Would anyone in the know care to comment, at least it would quash this proposal which BAA seem to trot out from time to time.