Standing outside the rear entrance (bus station entrance) of silverburn shopping centre. observed a single light/orb fly from west to east over the shopping centre. there was no sound or other normal landing lights or light sources visible near/on or eminating from the object. i immediately thought this was unusual and started to pay close attention. i then looked westt again and spotted three more orange lights/orbs flying in a triangular formation several hundred meters behind the first orb. same direction of flight under control, no noise or other light sources around or emminating from the the objects. this first group were then followed by another group of three lights/orbs flying several hundred meters behind and these displayed the exact same characteristics as the first group. finally a single light/orb was at the rear flying as above, and about several hundred meters behind. the eight passed over the shopping centre and out of my field of view to the east they were flying at approx the speed of a light aircraft or slower. i attempted to capture this on video with my iphone but the lights/orbs cannot be seen. my partner observed the objects as did another couple nearby who thought it was "really weird" i am ex military level headed and also hold a civil aviation authority license and always thought that most of ufo sightings were of know/natural events. however this sighting convinced me that what i observed was not any normal planes/helicopters/drones/birds or chinese lanterns passing overhead.