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Given the prayer, sounds like meat sacrificed to idols.
I always considered halal meat to be at least potentially kosher. With that prayer, I would say it would be impossible.
Not certain, but I believe there are certain voluntary restrictions for Christians (kind of advisory, so to speak) about eating meat of this nature, as it impicitly gives credence to the disputed religious practice (historically paganism; her islam).
Jews won’t make the fuss; but fundamentalist Christians sure should, and they outnumber muslims, even in England, I bet — at least for now.