The Queen is in Norfolk to start her annual Christmas holiday at the Sandringham estate.
Her majesty arrived at King's Lynn's newly-refurbished station just after noon and was then taken to nearby Sandringham in a black Range Rover.
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The employee was sorting through rubbish at waste company Amey's Waterbeach facility.
Ice is expected to form on some surfaces from late Tuesday afternoon and last overnight into Wednesday morning.
Ian Tang was last seen at 2.30am on Sunday leaving the KA club in North Walsham.