From an article in the Mirror UK:

A police source said: “We are finding more and more of these along with drugs and other weapons on raids in cities across the UK.

“Many are one-offs, ordered through the post by misguided people but others are being used by gangsters for robberies or torturing rivals.

Lord West, a respected former security minister in Gordon Brown’s Labour government, said: “It does seem extraordinary that such a dangerous item is so readily available.”

…they had become the weapon of choice for organised gangs.

…are being sought and used by organised criminals, it is concerning that these items could easily end up in the hands of children.

“Anyone caught trying to smuggle dangerous weapons into the country will have them confiscated and could face prosecution.”

Is it a machine gun? AK 47s walking in again from mainland Europe? Perhaps a small artillery device? RPGs?

Nope: a cheap stun gun.

Stun gun is on left and iPhone on right. You’d be hard-pressed to figure out which is more harmful. I am going with the real iPhone because of the roaming charges and excess data penalties.