"Hi,
I am unsure where to post this, as it might be a normal price or a bug (I don't take the train much)
National Express East Coast currently sells train tickets from london - brighton for this summer are at £3 each way.
What is weird is that the nationalrail website price them at £5, but that none of the 14 other train operators has these tickets at £5 (their cheapest is £13 or so).

It might be the same for other south-east or national destinations, but I don't have the time to try. If you try, give us feedback ;-)

So, if like me you're planning a couple of days in Brighton this summer, enjoy!

edit 1: be sure to select 'London Victoria' not 'London (all)'

edit2: also works for Portsmouth and other stations in the south east. Thanks pompeyrich for testing!"

http://www.nationalexpresseastcoast.com/

Thanks Scrapper.
I may be going down to Brighton tomorrow.
Looks like £6 return - cheapest I've ever known it to be in the past 15 years or so is £10!
Will let you know if it works.

This works, you have to buy before 6pm on the previous day... they can also be bought form any London "Advance Tickets" counter.