Bahnstormers in Alton Hants, not exactly South Coast but it is a fabulous ride to there from W Sussex coast - Chichester - Mid Lavant - South Harting - Petersfield - up Bell Hill through Steep then right at the A32 towards Alto into Lower Farringdon. I like their service department, very thorough and go beyond the fixed price service to make sure the bike is just right. At my 6000 mile service, their top Gen 3 technician decided that my brake cable had been routed incorrectly close to the headstock at factory build and spent an hour correcting it at no charge to me. I like that sort of OCD. The coffee is really good / the bacon and egg roll was superb and the ambience there is good with lots of friendly banter if you want to join in.