No I am a solicitor in Scotland and I don't think they can do this. There is a case on this in England which says so. Unfortunately there isn't a definitive answer just now as the case is being appealed but you should intimate a claim to the Trustee that you are seeking return of the monies received from the PPI claim. I will post the name of the case for you. I hope that helps. Please leave a positive rating so that I am credited for my time.
Green v Wright is the name of the case. https://www.stephensons.co.uk/site/news_and_events/uptodatenews/voluntary_arrangements_precedent_set_at_high_court