Saturday - 21.9.2013 - an unexpected arrival at Newhaven Town

This looks like an extra service. The passengers that got off wouldn't have justified an 8-coach special on their own. They went across the road and packed out an east-bound Brighton & Hove 12 bus. Brighton & Hove Albion FC weren't playing today, so it doesn't seem like a football special. I expect someone will be able to enlighten me - one of my friends accesses working timetables so he may solve the mystery. 22/9/2013 There was a fatality at Polegate yesterday, so this could have been an Eastbourne-bound train depositing passengers at the nearest point to a bus route to Eastbourne, having been diverted at Lewes.
For those unfamiliar with Newhaven's three stations - Town is on the main road, A259, and is in fact the station for the current ferry service to Dieppe. Harbour is a little used station serving relatively few houses and some businesses in a much diminished industrial area. Marine is the former ferry terminal on its own branch off the Seaford line. It hasn't formally been closed and there is theoretically a service, provided by taxis. The station is unsafe for public use, but the tracks remain and as in this case can be used as a headshunt or storage for services terminating at Newhaven Town or Harbour.