When this subject comes up the Brits never seem interested in human sacrifices by their ancestors and relatives.
1.The Romans recorded that the Celts sacrificed people and ate them. Archeological digs have verified this practice. Bodies (human and animal) have been found in sacrifice caves.
2.The Romans also chronicled the Druids putting people in wicker baskets and setting them on fire.
3. Bog sacrifices are in various place in Northern Europe including Britain.
4. Also the ancient Germanic practice of hanging human sacrifices in trees is thought to be the origin of the practice in some cultures of decorating small trees with Easter eggs.
As in the New world the coming of Christianity put an end to the blood letting.
Aztecs carved beating Hearts from their victims.
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Messy business.
The sanctioned murders of alleged witches, including here in America, were not a form of human sacrifice, but were the result of nitwit superstitions, delusions, gullibility, unfounded fears, and the madness of crowds.