Since the article didn't specify that it was a quad/octacopter type, perhaps it was a military target drone(sea and air assets practice engaging electronically) or loyal wingman UAS test. I know for certain these are flying now, and flying in the UK. They are a fraction of the size of a manned fighter but have a flight envelope of a manned fighter. But they do look like a traditional jet aircraft only much smaller, like large RC aircraft. The target drones are sometimes painted bright orange, but other time standard military grey.