This is the moment triple killer Nicholas Prosper bought the shotgun he used to shoot his family the following day.
He faked a firearms licence and then paid £600 for the gun and ammunition, picking the weapon up in a public car park. Police investigated the seller and decided no offences were committed.
As Prosper returns home carrying the gun, CCTV captures him opening the door for a delivery driver and smiling politely as they wait in the lift.
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