I am running the Brighton Marathon this Sunday and we will be driving in from our Airbnb in Wilmington (near Eastbourne) in the morning of race day. We will probably be driving along the A27 - does anyone know how congested that road gets on that morning? Or have any tips on the time we should allow to get into Brighton from there. It's a long shot I know, assuming only marathon runners from Eastbourne will know the answer - but just want to ensure I get on that start line in time!!