Runway system capacity
MAN's close parallel runways give you in effect 1.5 runways, not twice the single runway capacity. This is due the need to facilitate crossing of 05L/23R, and the SIDs which mostly follow the same initial routing off 23L. It certainly can't be compared to LHR's wider-spaced runways which can achieve more or less double the single-runway throughput. MAN is also constrained by the northside taxiways which are still set out around the old three-runway WW2 layout.