The website states:
The first section is due to roll at 12:00 local time and it is estimated that there will be 4 minute gaps between each subsequent section getting airborne, meaning the last section will be airborne by 12:36 local.
The three routes that pass over Brighton are the 7th, 9th...
So according to the route maps, the purple, brown and black routes are flying over Brighton. Anyone any idea of how long Goodwood > Brighton will take them?