Many years ago, I used to watch a series called Stargate SG1 and they had little aliens called the Asgard who were like defenders of Earth (clearly pre-any Marvel heroes).
I wouldn’t be surprised (since the Asgard are very small) if they are thinking of staging a comeback, having read the thread on how bad the UK is and they tested the waters, so to speak, in @Letitsnow32 garden. Clearly, you are now meant to put an X in your window, because ya know, you want to believe…
However just in case the thought of aliens running naked around your garden, having been beamed down like Kirk from their spaceship The Enterprise is giving you the wellies OP, fear not, I have an alternative theory that doesn’t involve aliens but does involve small half-naked creatures. Yes, you guessed it. Winky, whilst aimlessly wandering, or rather, disapparating around the UK, still heartbroken over losing first (and second) Barty Crouch, followed by that charming yet fierce defender of the (magical) faith Dobby, clearly apparated into your garden, ran around it in a fit of panic and then disapparated out again.
Did you by chance hear a loud crack? if so, that probably wasn’t local yobbos stealing someone’s outside decorations, but more likely Winky leaving before being nabbed by the Ministry for using magic near Muggles! Also, if, by chance some local yobbos did make off with someone’s outside decorations last night, wasn’t it clever of Winky to time her escape at the moment that the yobbos made a lot of noise?