David Miliband, who triggered the South Shields contest when he decided to quit as an MP, congratulated Labour's Emma Lewell-Buck, who won the seat with a reduced majority of 6,505.
More top news
After a remarkably mild November - a notable mild start to the new month.
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.
At least 300 people are actively promoting and recruiting for the terror group from within the United States, academics have found.