Gary McKinnon's mother Janis Sharp thanked Home Secretary Theresa May for blocking her son's extradition, saying: "Thank you Theresa May from the bottom of my heart - I always knew you had the strength and courage to do the right thing."
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The installation is the first in London by acclaimed British underwater sculptor Jason deCaires Taylor, part of the Thames festival.
Services through Kempton Park were suspended over the weekend due to an "obstruction on the line".
A leading sexual health clinic has apologised after mistakenly sharing the HIV positive status of hundreds of patients in an email.