Gary Heseltine is a police detective with more than 17 years service and has been following the UFO subject for 32 years, since a childhood sighting aged 15. He is the editor of UFO Monthly.com

My top ten, in chronological order:

1. On 11 August 1944, whilst over France, a Lancaster bomber crew of eight saw what they described as a huge disc-shaped object with a row of lights that dwarfed their aircraft many times over. Upon landing, the crew officially reported what they had seen and were told not to talk to anyone about it and not to record the information in their log books.