A judicial review can instruct the government to adopt tighter regulation and controls.
It would a major and somewhat brave decision to strike down the project completely, given it has passed the House of Commons.
Conditions and restrictions? Possibly.
Striking it down? Unlikely but not impossible.
Stranger things have happened as Boris becoming PM might make this a moot point.
There are some on here who are the R3 equivalent of remoaners IMHO. Navpi is running a one man campaign here to stop tens of thousands of new jobs and the first increase in hub capacity in my lifetime. But yeah, too expensive and difficult.....