Collect two out of the six differently numbered tokens printed in the londonpaper over the next two weeks (starts today). Upto four people can travel together with one set of tokens.
Last date of travel is Sunday 16 March (excludes 8 to 17 Feb 2008 - half term I guess). Bookings close 3 Feb 2008. The national express lines run from London to Edinburgh and beyond (the old GNER route), includes, Leeds, York, Newcastle and numerous others. Single standard tickets start at £8 from London to Leeds (per person), and £11.50 standard from London to Edinburgh. I don't know if you can start the journey anywhere other than London. From experience tickets get booked up early - so get in quick.
Seats are available on off-peak services with limitied availability on Friday and Sunday afternoons. Bookings must be made at least seven days in advance.
Full terms and conditions can be found at thelondonpaper.com (just checked the website has not yet been updated).