"UK police officer here.

It's a section 5 firearm for the purposes of the law. If you're found in possession you will be arrested. Any decent cop would be searching your premises under a S.18(1) warrant for further evidence.

Carrying it for self defence is not a defence, neither is an ignorance of the law itself.

There are various intelligence operations which target products purchased online and distributed to UK addresses. If you order it online there's every chance it will be intercepted before it ever reaches you and you'll end up with a police officer at your door (have done this several times myself when people have ordered certain types of knives).

Let's also cover the idea of using it in self defence. Depending on what type of incapacitate spray it is will have an impact on several things. The first being it's spread and distribution. Paca requires a direct spray and contact with the eyes, anywhere else it's near useless. CS can be sprayed anywhere and it'll likely have an affect, downside is it'll probably wipe you out as well. Then you're in a situation with almost certainly a bigger person both half blind and unable to see or think straight.

It's a horrible situation to think about but unfortunately escalating by carrying a firearm (regardless of your thoughts of the item) isn't the way to go."

@Marshalist

Durne prawo, masz prawo się bronić, ale nie możesz mieć ze sobą gazu który uznawany jest za nielegalny.