Brighton traffic
I live near Brighton. The traffic situation is about what you'd expect. It depends on the timing. The worst I ever see is trying to re-enter Brighton at peak times, ie early evening when the commuters flow back and sometimes on summer weekends when it can get pretty bad. OTOH there's more than one route from Burgess Hill to Brighton even if the A23 is the fastest most direct route. As for food and entertainment Brighton is London-by-sea compared to Burgess Hill.