Doncaster Mansion House holds open day tea dance Slyvia and Donald Hagin, pictured during the Tea Dance at the Mansion House. Sign Up To Our Daily Newsletter Sign up 0 Have your say An open day was held yesterday at the Mansion House in Doncaster to showcase its history dating back to the mid-18th century. The Grade I-listed building hosted a tea dance and tours. Raymond Smithurst is pictured by the Peace Window. Low-tax freeport on the edge of Yorkshire 'may allow employers to avoid national insurance contributions'