I have been watching this thread with interest for a few weeks now and now that I have finally joined I can comment!
I have a terrible time normally with mosquito bites - those pesky insects seem to love me. However, a couple of years ago we were going to Sorrento for our silver wedding anniversary and someone recommended to me that I use Boots After sun with insect repellent in it. I have never looked back!! It really works and also does not smell horrible like the sprays. I used a spray one year and ended up with no acrillic left on my nails - you know what that is like ladies. Anyway if you haven't tried it I would highly recommend the Boots after sun. Be careful though as I have picked up the one without the insect repellent in it before as they both look very similar. Let me know if it works for you!