Police have released a new image of a missing 15-year-old girl known to be suffering depression.
Ella Hysom was last seen on Monday in Clements Road in Ilford walking towards Cineworld.
She was recently treated in hospital suffering for the condition.
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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.