Pope was very skeptical at first, but soon found that there was a good chunk of UFO sightings that simply couldn't be explained using conventional thought.

"The best example is Britain's most famous UFO case - the Rendlesham Forest incident of 1980. Essentially, a UFO landed between two military bases; all the witnesses were military, three 'landing' indentations were found in the clearing in the forest and a Geiger counter showed the radiation readings in the area were ten times higher than normal. That really made me think there was hard evidence of UFOs visiting Britain."

-Metro Cafe: 60 Second Interview with Nick Pope
-nickpope.net: LINK