Some great suggestions from everyone here
Ann's suggestion is: Chasing Cars - Snow Patrol
Mine would be: Apocalypse - Hawkwind
Others would be:
Baby Driver - Simon and Garfunkel
Comfortably Numb - Pink Floyd (That neatly sums up a long journey in an eight)
Perfect Day - Lou Reed and the Velvet Underground
Diamonds & Rust - Joan Beaz (There's a theme here)
When It's Cold Outside I'd Like To Die - Moby
Salve Mea - Faithless
Me and My Monkey - Robie Williams (I know, but I love everything about this song)
Sweet Home Alabama - Lynyrd Skynyrd
Come Away With Me - Nora Jones
Down By The River - Groove Armada
Funnily enough, we've spent several hours this week compiling a playlist for this trip. Done the old-school way, but transferring an actual copy of the songs onto an SD card.