Hello
Viewing is great when the red arrows split and come over about 50ft ! also you may get shots from above the aircraft over the sea, but overall its better in eastbourne, maybe from the pier but there are lots of places near the beach.
Last year i went for 2 days and spent a bit on beachy and in the town , beachy was cold ! and there is a harry ramsdens chip shop in eastbourne 🙂