UK Law: While UK law generally requires all farmed animals to be pre-stunned to prevent pain, it provides a legal exemption for religious slaughter (Halal and Kosher)
Permitted, but most Halal meat in UK comes from normal British slaughterhouses operating to normal British standards. As you know, the only difference is that a prayer is recited in the slaughterhouse.
Which, as you know is not remotely inhumane.
As you also know, all Kosher meat has been slaughtered unstunned.
It's odd that the Muslim-haters think this is a good way to stir up ethnic hatred.