Hi,
I have a ticket, which I will not be using.
NB! YOU MUST HAVE 16-25 YOUNG PERSONS RAILCARD
Travel date: 30 June 2012, train departs 13.30 from Edinburgh.
Edinburgh Waverley to London Terminals (train arrives to Kings cross and you can travel further through london to any train station for free)
The cheapest ticket for that day is now £30.35 with railcard discount (just checked), so I think £25 is a reasonable price to ask.