North Wales Police discovered a significant cannabis farm within the historic Plas Glynllifon mansion near Caernarfon, Gwynedd, on Tuesday, April 7. The Grade I-listed property, which once hosted a ball for King Charles III following his investiture as Prince of Wales on July 1, 1969, was found to have approximately 12 rooms on its top floor dedicated to growing mature cannabis plants. Superintendent Arwel Hughes described the operation as a "significant grow," noting manipulated electrics and diverted water supplies, and expressed confidence in making arrests as forensic work continues. The privately-owned mansion and its surrounding gardens are currently the subject of a police cordon.