Disturbing footage showing "routine abuse" of sheep in a halal slaughterhouse has reignited the debate over whether animals should be stunned before they are killed for meat.

Under halal law, animals are supposed to be killed quickly by single cut from a surgically-sharp knife.

Although 80 per cent of halal meat is stunned, the number of sheep killed without stunning is rising due to campaigning by Muslims, figures show.

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