On Friday 20 May, Mary joined the Labour In for Britain battle bus for its tour around Yorkshire, campaigning for Britain to remain in the EU ahead of the referendum on 23 June.
Mary was joined by Labour colleagues from around the region, visiting local businesses in the party's campaigned for Britain to remain in the EU.
Over a third of a million Yorkshire jobs depend on trade with the EU, through local factories of multinational companies like Haribo, Nestle and Coca-Cola. The CBI has warned the uncertainty around the referendum could harm British businesses and cost British jobs, British growth and British investment.
To get involved in the Labour In for Britain campaign, visit www.labourinforbritain.org.uk