Boots baby rice cakes are dead handy, we've found - for a while K couldn't manage them as they were too little (so she had half an adult one instead), but her dad pinched them for the car as they're a great driving snack! I carry some everywhere now as they quiet the "I'm huuuunnnngrrrryyyy" complaints from all quarters ;) Dried fruit is good, ofc, though stuff like apricots can get pretty sticky. If you have a Cranberry shop near you (cranberryuk.com) they do lots of organic stuff (and tasty baklava for mummy!) - I generally make a stop at Piccadilly station if I'm out in Manchester for the day and stock up there before heading out.