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 mayor, on a Brexit-themed visit to Paris, said he had not given up hope of securing a system of 'London only' work permits.
The dog, which is not a breed prohibited under the Dangerous Dogs Act, attacked its owner in Wood Green last week.
Flights were temporarily suspended on Tuesday evening after the group entered a secure area and erected a blockade near a runway.