Boris Johnson is set to launch a programme of free activities to encourage Londoners to get more involved in basketball.
It comes ahead of The Euroleague Final Four basketball tournament held next month at the O2.
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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.