I was in a thread with nostr:npub17u5dneh8qjp43ecfxr6u5e9sjamsmxyuekrg2nlxrrk6nj9rsyrqywt4tp about this very thing. The only recourse is for individual judges to find him in contempt of court but so far not one of them has.
I guess lying on the stand is A-Okay with both UK and US judges.