He thinks it is "critical that we begin talking now about the long-term ethical implications the robot revolution will surely bring".

He continues: "The use of robotics in the military is on the up and, although the decision to take human life is currently still taken by another human, before long such decisions will be made up complex mathematical and logical rules programmed within a robot."

"Potentially the consequences of a computer crashing could be devastating. Hence, robotic defence is not just necessary for tackling combatants, but potentially for making sure we have control over our own weaponry."