Ideal For Summer... Bought these last year from poundshop and they are totally unsuitable for purpose. It says to let them warm up for 20 minutes, Great, but at 25 minutes they've gone out! It says, shake to evenly distribute the coals, Again great, but the container is made of foil with the structural integrity of oven wrap, and it just folds up in your hands. They are simply not worth paying a pound for. However, at just a bargainous 50p, thats right, just FIFTY PEE - these are worth every penny. Free to collect or I will post at cost