Correction. The ruling came from the Appeal Court not the Supreme Court. Plan B is a legal charity.
'Plan B’s challenge was one of a number of legal challenges against the government’s national policy statement, which gave the go-ahead for the new runway in 2018 after MPs backed it by a large majority. Others were brought by local residents, councils, the mayor of London, and environmental groups including Friends of the Earth and Greenpeace.
The challenges were dismissed in the high court in May 2019 but the complainants took their cases to the court of appeal, which delivered its verdicts on Thursday.