The natural disguise for all secret anti-alien organisations* Unfortunately, it does mean that at 11am, everyone, and I mean everyone, has to stop for a union won tea break**
*and cloud bases, but they aren't as realistic ( ) as secret bunkers 40 ft underground.
** each tea break must be supplied by a kindly lady of indeterminate years***, with a selection of slightly old biscuits.
*** despite the huge egos in the studio between cast and crew, the tea lady in fact knows far, far more about movie making than anyone, and she and her husband discuss it briefly before he goes off to his allotment of an evening.