So as you're all probably aware the UK is pretty strict on its gun laws, imitation firearms have laws which mostly fall down to common sense. If your gun looks real, don't go waving it around in public or you might have issues with the fuzz.
So it piqued my interest the other day when I saw this article pop up https://archive.ph/stsIo a kid got rammed off his bike for having a water pistol? How shocking! Even the article banner shows you a bright pink pistol, how could the police be so incompetent?
Now cut forward a whole 6 minutes.. it's because the kids black obviously! https://archive.ph/yzis7 And it's totally not because his water pistol looks more like a glock than an actual water gun... It's white and blue!
I've seen that waterpistol, a friend brought it on a trip. It definitely looks real enough at a glance, and it has very similar proportions to a glock. We quickly learned to keep it hidden in public.
Whichever parent let this kid wave it around in public should be facing legal consequences.