By Tim Hanlon An abusive wife screamed to neighbours for help as part of a ploy to make them think it was her being attacked. Footage from a nanny cam shows Sheree Spencer, 46, shouting at her husband and threatening him with a knife during a 20-year reign of terror. The lid was finally lifted on the abuse after a friend of husband Richard Spencer, 47, found out what was happening from a nanny cam and went to the police. Videos show the attacks at the family home in Bubwith, East Yorkshire which led to Spencer being jailed in what the judge said was the “worst case of controlling and coercive …