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Watch Sky News live. Today's top stories: Boris Johnson is self-isolating after an MP he had a meeting with later tested positive for COVID-19. Four astronauts have begun their journey to the International Space Station (ISS) after a historic SpaceX launch. Two new "mega labs" to turnaround 600,000 coronavirus tests a day are planned for next year, as Boris Johnson tries to draw a line under losing two key advisers.
