Calum Graham carried the torch through Gretna before going on to act as a witness for a wedding in the town.
He said it had been a day that dreams are made of.
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One hundred artworks have been donated to an auction, to raise money for victims of flooding in Cumbria.
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The 14-year-old's body was found in a cemetery in Carlisle last June. George Thomson and Brahnn Finley have been found guilty of murder.