I'm not a UFO buff, but this story out of Stratford-on-Avon is interesting. (Also see the video footage linked to the article.)
Three skeptical explanations have been offered: fireworks, hot air balloons, and floating lanterns. The fireworks theory is clearly wrong; as the shaky cell-phone footage makes clear, the lights stayed in formation for an extended period of time. Hot air balloons seem doubtful, since multiple witnesses reported the lights maneuvering in complicated ways; besides, if a bunch of balloonists were flying around at night, wouldn't someone know about it?
That leaves the lanterns. Apparently a local rugby team had floating lanterns on display, and some of them had broken loose. One witness said,
It was weird, they way they moved did look alien. Some people reckon they're fireworks but they were lit up in the sky for far too long, the local rugby club say they were lanterns that blew loose over the weekend but these objects were far too fast and too high up.
Hard to know what to make of this. How does he know that the objects were "too high up"? It's almost impossible to judge the altitude of a light in the sky. If the objects were closer to the ground than he believed, then perhaps they were not moving quite so fast, after all.
I guess I'm inclined to go with the lanterns as an explanation ... though I wonder why they remained in formation for so long.
Of course, the other possibility is that some ETs are Shakespeare fans, and decided to drop by the Bard's hometown. Someone should tell them to read this book.
But that's a whole other contr0versy.