At stops it'll either be in sight from where I am, being watched by someone else (i.e. taking turns to go into a big supermarket in a town), so far in the sticks that there's simply no-one to steal it, or as a last resort I lock it to something and be quick.
Most other bikes aren't locked at all so even a cheap lock will mean a very unlikely thief is going to pick someone else's (unlocked) bike rather than yours.
Be careful at the start/end controls in urban locations though, that's where the few bike thefts have taken place. I'll always lock mine up before the start and at the end (unless it's the middle of nowhere).
I've done 50+ Audaxes and the only lock I carry on them is a 3 digit combination "cafe" lock (for a ~£2k bike):-
http://www.evanscycles.com/products/abus/combination-lock-1150-ec006190
At stops it'll either be in sight from where I am, being watched by someone else (i.e. taking turns to go into a big supermarket in a town), so far in the sticks that there's simply no-one to steal it, or as a last resort I lock it to something and be quick.
Most other bikes aren't locked at all so even a cheap lock will mean a very unlikely thief is going to pick someone else's (unlocked) bike rather than yours.
Be careful at the start/end controls in urban locations though, that's where the few bike thefts have taken place. I'll always lock mine up before the start and at the end (unless it's the middle of nowhere).