Playing around on brfares.com, I found that, unusually for such a long distance, there are no through Advance fares available between Stamford (Lincs) and St Ives (Cornwall) - see http://www.brfares.com/#expert?orig=SMD&dest=SIV
This must be around 450 miles or so each way.
Can any other origin/distination pairings beat this?
This must be around 450 miles or so each way.
Can any other origin/distination pairings beat this?