They'd buy time and write a different story. There's no reason to worry about a headlong plunge into it or falling tax receipts.
And how would they do this?
As I said, by extending the A50 process, or even by revoking A50 notification altogether (if the ECJ decided that the UK could just do this without the consent of all 27 other member states).
@Oliver Schick started
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And how would they do this?