They were outside Sainsburys in Camden on Saturday. I called the non-emergency police number and it turns out that the "license" they claimed to have was not real and just knocked up on a computer, so they were collecting illegally.
The cop I spoke to, amazingly, was fairly well informed about the UCKG and thanked me for calling the police.
He said that it takes months to obtain a proper license and they won't be able to get one this side of Christmas.
His advice to me was that if I saw them of any other UCKG carol singers I should call 101 (non emergency police no) and report them for street collecting without a license. The cops will turn up and move them on.
I very much doubt that the other UCKG carol singers have proper licences. You should ask to see the license if they claim to have one. The fake one that showed me had no Met Police seal on it, was just a piece of paper with a false claim written on it saying that they had permission from the police to collect outside Sainsburys, M&S and Tescos.
Also, and this is important, the drones doing the carol singing are victims of the cult, so it is important to try not to get angry with them. Just call the cops and get them moved.
Some interesting videos on youtube form a former UCKG member, including this one