Another friend of Joshua Folkes, 17-year-old Saffron Davis, 17, said:
"I've known him for 15 years. I still can't believe it. He went to Christ College. He introduced me to rap music, he listened to everything. I'm going to start crying. He was an only child. He had an uncle though, who he was really close to. I just feel for his mum."
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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.