Sadly Southern are stopping the Downlander Ticket, a pity as I found them great value to explore the south coast.
From the Southern Railway website:
"Downlander tickets are being discontinued
From Monday 8 September 2014 Downlander tickets will no longer be available for travel on Southern Railway.
Downlander tickets will remain available for purchase up until Friday 5 September, with the final available travel date of 7 September 2014.
Customers who wish to purchase tickets for unlimited Off-Peak travel on Southern Railway only, will be able to do so from our main website at
www.southernrailway.com/DaySave
DaySave tickets are not valid for travel on any bus services or the services of any other rail company."