ClientEarth is an environmental lawyers organisation that brought the case to the Supreme Court. It comes after the Court of Appeal declined an application for judicial review of the Government's plans to improve air quality.
Today Lord Carnwath JSC backed ClientEarth's case, ruling the Government is breaching article 13 of the EU Air Quality Directive.
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.