81 dorset avenue birtley dh3 2dx royal mail address

According to the Royal Mail's postcode lookup tool, the correct address for 81 Dorset Avenue, Birtley, DH3 2DX is:

Royal Mail Delivery Office Gateshead Delivery Office Gateshead Tyne and Wear NE11 9JG

Please note that this is the delivery office responsible for handling mail and parcels for the DH3 2DX postcode area, which includes Birtley.