A 46-year-old Cambridge man has been jailed after using false identities to stalk a 16-year-old girl during an increasingly bizarre and sinister campaign of harassment. David Irving, of Beaumont Road, caused his victim and her family to feel scared and disturbed. Three innocent people were also arrested as a result of his behaviour, but were later released with no further action. The ordeal began when Irving sent an anonymous letter to the victim’s father in November 2021, containing an edited image from her Instagram account. He also sent anonymous letters to the headteacher of the victim’s s…