If you exclude 'free' trips, either because there was no tickets sold, or you got a refund, or got given a free ticket, then you couldn't really beat the £1 tickets available only on Virgin Trains when Thetrainline was new in around 2001. The 0640 Class 47 from York was one particular train that had high availability on Saturdays. It was possible to do York-London by getting off this train at Tamworth, then getting a Class 87 (ex-Liverpool) to Euston. In the evening the best bet was via Brum for a HST. This was possible for £4 in total, and I did this once, but the WCML was closed on the return due to the wires being down as a result of severe weather conditions, so had to go via King's Cross, at considerable cost to Virgin.
The best at present seem to be Megatrains Edinburgh - Birmingham for £1
Peter
I think the Megatrain map is wrong, like yourself I can never find Birmingham to Edinburgh tickets despite them being on the map. On the other hand there are plenty of very cheap tickets for Birmingham to London during the week even though that isn't on the map.Are they running again? Over the summer I thought they'd given up as I couldn't find any rail services between the two cities in either direction trying a broad range of dates.
Did Chester to London and back for £0 in June with the Daily Mirror offer. Can't get any cheaper than that!!
Thinking about it...That cant be £0 becasue you still had to purchase the newspaper in the first place...
Thing is though...is this thread for Longest Route - Cheapest Ticket for pay on the day or all these different offers here there and everywhere?
So then are all of these tickets advanced purchase? months in advance...
Cheapest ticket available on the day that I can think of is £1.65 for a Cheap Evening ticket from one side of the GMPTE network to the other, say Appley Bridge to Marple/Strines.
That's a walk-up, pay on the day, off-peak fare, works out at just over 2.2 pence per mile for the 74 mile round-trip.