With the help of opera singer Lucy O'Byrne, the doctors reveal the hidden muscle that makes you breathe. Dr Xand heads to a DNA laboratory to solve the mystery of who stole his strawberry milk and there is a chance to play along at home with another mind-bending trick. Meanwhile, the ouch-mobile is open for business, and over in accident and emergency one patient has cut their eyebrow and another has stapled his own finger.

The show’s own verdict is on its page.