Harper Adams University develops high-visibility drones

There are warnings from the RAF in Shropshire who say it is only a matter of time before one of their aircraft collides with a drone causing a potential disaster.

RAF Shawbury provides basic helicopter training for all three of the armed services - Princes William and Harry both trained there.

Pilots say they're seeing an increasing number of drones flying in the area.

Nearby Harper Adams University, which is investigating the use of drones in farming, is developing ways of reducing the risk by making them more visible.