The Government warned climate change protesters at Heathrow last night to stay within the bounds of the law, as fears grew that militant elements would mount illegal protests. Downing Street said that any disruption to the airport’s day-to-day activities would be “unacceptable”, as one spokeswoman for the “climate change camp” said that illegal protests could not be ruled out. “People do have a right to protest in this country,” a Downing Street spokesman said. “But the Government believes action that would disrupt the running of Heathrow would be unacceptable.” Some 250 people had set up camp last night on private...