Ahhh that will explain why I haven't seen any of their old red buses for a while then. I believe their forerunner was another short lived company called Countryliner.
I've just seen that Metrobus have introduced a new timetable for the 271, with buses running more frequently between Crawley, Haywards Heath, and Brighton, from 29th April, presumably as a reaction to SussexBus withdrawing their 40 service.
I wonder exactly where that leaves SussexBus, as they...