> The airport said it had spent several million pounds to purchase the equipment. I feel like this is a problem some smart people could solve quickly if they were asked, similar to the healthcare.gov situation. Ask some MIT students to come up with a solution over a weekend and I bet they would deliver. Knocking a slow moving object out of the sky is literally not rocket science.
It gets a little more complicated in the real world if you don't want to shoot down the wrong flying objects and also not kill people on the ground.