I'm camping in July for a week at a site that doesn't have ehu 
I actually don't mind that but what I will mind is not being able to charge up my smartphone to mumsnet. Dh is dropping us off and taking the car so I won't be able to use an in-car charger and I won't have access to a USB socket so won't be able to use one of those chargers. I've been looking at solar chargers but they seem to get mixed reviews. I also don't want to spend a lot of money (£20-25 max). Any suggestions or recommendations?