You will need this licence if you intend to store Security Sensitive Ammonium Nitrate (SSAN) in bulk or in packages.
SSAN is ammonium nitrate, or any ammonium nitrate mixture containing greater than 45 percent ammonium nitrate. However, solutions which include ammonium nitrate are not required to be licensed for any purpose.
A licence for the storage of SSAN gives authorisation to store a particular type and quantity of SSAN at a specified location.