Interesting to see that the media don't seem to have picked up yet on the revised northwest runway option that was a late addition to Heathrow's submission to the Airports Commission.
This would involve moving R3 around 250m S of its originally-planned location by replacing the T6 toast-rack (see today's DM graphic below) with satellites aligned E-W, thereby leaving room for R4 running roughly along the line of the M4 (which would be tunneled).
