National Express buses serve the region from London's Victoria Coach Station. Trips to Brighton and Canterbury take two hours; to Chichester, three hours. Megabus runs buses at budget prices from Victoria Coach Station to many of the same destinations as National Express and can be cheaper, although luggage limits are strict.
Bus service between towns can be useful but is often intermittent. Out in the country, don't expect buses more often than once every half hour or hour. Sometimes trains are a better option; sometimes they're much worse. Traveline is the best central place to call for bus information, and local tourist information centers can be a big help.
Megabus. 0900/160–0900; www.megabus.co.uk.
National Express. 0871/781–8178; www.nationalexpress.com.
Traveline. 0871/200–2233; www.traveline.info.