I might just join for the run, meeting up at the layby near Pembury would probably be easiest for me since I'd come down via the A228, I just need to figure out which of the laybys it is :)
I'm guessing it is the one between the A228 and the round-about that goes off to Tunbridge Wells Hospital? I'm making this guess purely based on the fact that google street view has a snack van parked up there