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He does not have to go unless the judge summons him.
If his evidence is something the trial depends on, he will get a witness summons and be expected to turn up very very quickly.
He does not want a judge to summon him because if he then fails to turn up the police will find him and arrest him. If he still refuses to give evidence once at court, he will be in contempt of court.
Best thing he can do is turn up on the day and tell the ushers he will not be giving evidence.
They will then relay it to the judge who will most likely throw his evidence out (probably resulting in a collapsed trail if there is no other significant evidence) or will have his statement read out in court but will not be required to undergo cross examination.
It's a shit situation to be in.
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