We are going to a festival, camping for 4 nights. We have a bell tent, there are 4 of us (2 adults, 2 children-8 and 5). We have inflatable mattresses and sleeping bags.
We are going to take hot water bottles and lots of blankets, as May is cold in the UK from past camping experiences (and last time we were in a yurt with a wood burner, no such comforts this time).
Do you have any other ideas of staying warm through the night, are there any safe heaters/other great inventions to keep us warm and toasty?