Detective Sergeant Hannah Wright, of North Yorkshire Police said:
"If you witnessed the robbery or can help identify either of the people involved I urge you to come forward and contact the police or Crimestoppers straight away.
"I am particularly keen to speak to anyone who may have seen the two suspects after they left the store or saw anyone acting suspiciously prior to the robbery."
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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.