The Mayor of London, his HIV Ambassador pop star Annie Lennox and the Terrence Higgins Trust are celebrating 30 years of the charity and the HIV response in London.
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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.