No offence Itchin, but I spent literally decades based at LHR and living in the surrounding areas. Accordingly, I'm more than familiar with the local woes, geography and all the historical decision-making delays, finally leading us to where we are today.
Good inter-flight connectivity, and combined with excellent surface links, are obviously major factors towards the success of any airport.
My example of GLA could equally apply to a host of other UK feeder points. Indeed, you said, "...Business/Leisure/
Connecting air travel...".
Yes, that's right,
you said
connecting - or are you now retracting that bit?
Hence my previous remark,
A third runway at LHR is already years (decades?) late!
.