Over 57,000 children are set to wake up homeless in London on Christmas Day.
The charity Shelter says thousands of families are living in B&Bs or other temporary accommodation and the situation is getting worse.
Sharon Thomas has more.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.