The one sentence version is that we're taking the time achieved by distance based wake turbulence separation in low headwinds conditions (for example 4nm=90s) and then taking that time and applying it across all headwind conditions, so that in strong headwinds separation between Heavy/Heavy might actually be 3.7nm.
The result is that the landing rate is maintained is strong headwinds.
As Zooker says, lots on the
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Chevvron, for LHR it's obviously aimed at a dedicated landing runway, but it's also being developed to ensure it can be used at busy single runway airports, where you can compress the 'departure gap' in headwinds.