Self-taught chocolatier Ashley McCarthy has a prestigious commission for the Lord Mayor of York. He starts off making chocolate replicas of some of York's most iconic buildings but, halfway through, he decides to supersize his already tricky commission. In contrast, the challenge for realism expert Sarah Hardy is extreme in miniature. She has her work cut out when an entomologist commissions her to make a small chocolate version of a rare dung beetle. And former UK Master Mark Tilling creates a huge chocolate sensory garden for a Maidenhead hospice that's close to his heart.