Dark arts indeed, and seemingly a bit of an enigma, but at last these Pseudo Phantom Portaloo Pilferers can be exposed!
Who do they think they are just slipping into our wartime time space continuum and making off with any Tardis shaped object they fancy?
As expected our Alien alert surveillance system was triggered, and images where captured...but cleverly (yes aliens are very clever) they kept their faces hidden.
Luckily the last frame captured revealed one of them, realizing it was being filmed, desperately trying to contort it's ghastly visage into a close resemblance of one of the most cheerful and likeable humans around, but we aren't fooled..we know what they were..