If you look on the Southern trains website you can get cheap advance singles for either £3.75 or £5.65 if you travel from Victoria or East Croydon, the journey takes about 1hr 45min on this route but is much cheaper than Southwest trains from Waterloo, you can also collect / print out these tickets using the ticket machines at most local stations. I am travelling down this way on Saturday.
Anyone who travels regularly to away games and does not want to be tied down to catching particular trains or having to travel in groups would be well advised to buy a network card (£20?). Using that you get a third of all standard rate singles or day returns in the South East.
I believe that Weston-super-Mare is the only trip this season that is out of range for this deal.
i have been told by work mates that the A3 at hindhead is a nightmare so allow plenty of time , Danson mark network railcard now 25 quid still a bargain . waterloo to havant £ 17 35 return