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"There was blood in the cowshed, it was a very sobering scene," she said.

The couple's bodies were eventually found by police in the cowshed the in the early hours of the following morning, prompting South Wales Police to launch a major murder investigation.

In 2010, the festival's cowsheds were covered with enough solar panels to power 40 homes, making it the largest privately owned solar power station in the UK at the time.

Freddie Scappaticci once told one of his captives that if he had his way he would be hung upside down in a cowshed and no-one would hear him squeal as he was skinned alive.

A short distance down the rocky lake shore, the sheep parted, allowing us to drive on to Vogafjos, a farm-based resort with a restaurant in a working cowshed.