As you can see, there's more than one video on youtube showing the same UFOs over London from different shot from different parts of the city.
As the article suggests, it could be a marketing campaign, but nobody has yet to step forward and claim responsibility.
If they're real, cool.
If it's a marketing campaign, also cool. I hope it pays off better than Cloverfield.
“Activism is a way for useless people to feel important, even if the consequences of their activism are counterproductive for those they claim to be helping and damaging to the fabric of society as a whole.” - Dr Thomas Sowell
Diogenes of Sinope: "It is not that I am mad, it is only that my head is different from yours."
Arnold Judas Rimmer, BSC, SSC: "Better dead than smeg."