You can get 100% DEET on Amazon, I've just got it for our sunmer hols. DH and I will use it, DD will have it sprayed on her clothes (I don't know if there are any health concerns using it - but just being sure)
Thank ladies, the reviews for jungle formula have convinced me. Many thanks for the tip. (coughs apologetically), slightly misleading when I said campsite - we're in v v small mobile home. With air con. Not quite hardcore enough for tent in 35 degrees.
Incidentally, when we camped in Venice we bought a mosquito zapper thing from the site shop without much hope of it working. It was bloody brilliant. Small and worked on batteries. Kept the tent mozzie free all night.
Going back to fab campsite in Italy, loved it, loved it, loved it last year. best holiday ever. Apart from the vicious and relentless mosquitoes (well it's in pine woods, by the beach....) Got bitten to pieces despite spraying body with Autan of an evening, and campsite spraying God knows what in the air. Anyone found a REALLY effective mozzie spray/repellant that will wipe out the little bastards insects?