Unfortunately you can only go to prison for contempt of court if you have been contemptuous, the courts HAVE NOT ordered Boris to go to Brussels to seek an extension, the Supreme Court did not order him to go in their biased decision, therefore he CANNOT be jailed for contempt, he might be jailed for something the EU judges at the Supreme Court think up but I highly doubt it will be for contempt,the only thing they did was to make him re open parliament, which he did so no contempt there, just more remoaner clutching at straws I feel.