"It is fantastic that this renovation is now complete.
"It will provide a destination for visitors and locals on the Solway from which to explore this RSPB site and the surrounding area, as well as being a hub for volunteering and educational activities."
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60-year-old Frank Robertson doused Vaughan Livesey in flammable fluid which he lit with a 10-inch blow torch flame inside the victim's shop.
A fundraising page created by a Lake District chef, who died following the London Marathon, has seen donations top £90,000.
29-year-old Matt Campbell collapsed after running 22.5 miles. He received medical treatment at the scene, but died later in hospital.