The Duchess of Northumberland has invited people to come to her house for a walk to raise money for North East cancer charities. On September 6, she will host a six mile walk around the ground of Alnwick Castle. For more details go to www.emilysbigwalk.org.uk.
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All three lanes will be open between Leeming and Catterick, without roadworks, for the first time since the project began back in 2014.
The RSPCA say they do not know what the oily substance is or where it is coming from but some birds have died from the trauma.
Project leaders continue to work towards the estimated completion date of spring 2018.