Source?
Best I can find is his POCA case here (he lost) where they took his £500k , and the liquidation process of his companies. The much vaunted £21m VAT fraud disappeared into the ether, either with much schmoozing or a strategically negotiated settlement with HMRC.
I recall his defence in the POCA case was that if it succeeded it would prejudice any potential criminal trial in the UK, so at that point he was clearly expecting such a trial.