I hold the CAA 'Permission for Commercial Operations' Licence (No 1659) UAV use with night permissions. However I will only employ the technology if it is safe and practicable to do so and a full risk assessment has been undertaken. By law the maximum operating height is 400ft and not more then 500m away within visible line of sight.  I also employ the use of Bell Jet and twin engine Helicopters for the more complicated or higher then 400ft assignments.