A spelling mistake on a police computer allowed a man with a history of domestic abuse to kill his partner, according to a report.
The police watchdog has criticised the Northumbria force for mistakes that led to the death of Sarah Gosling in Newcastle earlier this year.
Watch Ben Chapman's report here:
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.