The Metropolitan Police wrote to Home Secretary Theresa May asking for the ban two days ago.
We have made this decision based on specific intelligence and information, and our message is clear - we do not want people coming into the areas to attend these events.
The three other boroughs affected are Tower Hamlets, Newham and Islington.
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They found a sheepish looking ewe with a traffic cone on her head in the middle of a field.
Most importantly we need you to look after yourselves and each other, remember there are no safe ways to take drugs.
Passengers looked horrified as the girl took the potentially lethal shortcut between platforms.