Any tips for surviving them?! Dd, 9 months is a nightmare in the car seat once she reaches her threshold for tolerating it - about 45 minutes. We're doing the 6 hour trek to Bristol next week... 
Ds, 3.4, has always been fine on long journeys but will now scream if his sister won't stop crying. Fair enough really, it can't be nice to listen to in the back!
We're planning stops where dd especially can crawl about, but this is easier said than done! I'm contemplating making a detour to a soft play for a long break - has anyone done this? Worth it?
Any other tips welcome. ds is recently potty trained too.. its going to be a fun trip isn't it?!