Stumbled over this nice article:
http://www.theregister.co.uk/2009/06/03/royal_navy_vs_ufos/Are we really sure we want to be facing aliens yet?
A Royal Navy warship may have come within seconds of opening fire on Unidentified Flying Objects above Merseyside, possibly narrowly avoiding the precipitation of an interstellar war and the extirpation of humanity by testy aliens.
Reports have it that the UFOs - speculated to have been visiting spacecraft from beyond the solar system - were tracked on naval weapons radars. ...-snip-
Rattler