Between the night of December 25 and December 28, 1980, strange lights and UFO sightings were reported in and around two US Air Forces bases, Royal Air Force Base Woodbridge and Bentwaters. Specifically a forest between these two bases called the Rendlesham Forest. These sightings and the incident that occurred between the craft itself and military personnel are considered the "Roswell of the UK." 

Sources:

www.therendleshamforestincident.com

Link to Lt. COl Charles Halt's audio recording:

https://commons.wikimedia.org/wiki/File:Rendelsham.ogg