Aircrew have been drawing sky willies for years...
Back before the 1957 White Paper killed them off, one of the VR squadron pilots drew one in the skies over Edinburgh. Some god-botherer complained, so the squadron got airborne, formed line abreast and flew through the thing - then repositioned on another axis and repeated their efforts.
So if anyone hadn't noticed the sky willy the first time, they sure as heck noticed it one the attempts at erasing it had been put into effect.