Just to add that Jet A1 is Kerosene so what you are storing it in as long as it is designed to store diesel/heating oil then there should be no problem, but put an aviation style filter system on it and do water sampling. Years ago one of my customers purchased a 1000 ltr bowser form a well known supplier. He cornered the salesmen about the difference in price between aviation and ordinary diesel ( 100%) the answer was they are the same but with a different filter and a bonding reel. Nice way of increasing the margin ( about £ 2000 for filter and bonding reel !!!)