I am traveling now, in Borneo awaiting transport to airport to plane for Oz.
My suggestions : Use Frio pouches, take them in hand luggage made of material that allows evaporation. At Heathrow I was told to put them in the clear plastic bags provided for liquids. Show any needles you are carrying in your hand luggage, no problem usually but you may be dealing with a learner security person.
Take extra everything as traveling does strange things to bgs even if you feel cool,calm and collected.
Get a letter from your GP, they usually have a template.
Enjoy your holiday.