I didn't want to start a new thread so searched for sewage. Britains warnings to avoid 83 beaches
All along the A259 ie the Sussex coast included.
https://www.mirror.co.uk/news/uk-news/brits-warned-avoid-83-beaches-29461331
St Leonards
Bexhill
Normans Bay
Pevensey Bay
Seaford
Saltdean...