Opemipo Jaji from Edmonton has been convicted at the Old Bailey of raping an 11-year-old girl as she walked home from school.
He followed her as she got off a route 192 bus and dragged her into Jubilee Park, where he subjected her to a three-hour attack.
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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.