Cardiac surgeon Betsy Evans operates on a patient needing a critical double bypass, and neurosurgeon Ryan Mathew performs awake brain surgery on a patient with a growing tumour.

Children's heart surgeon Osama Jaber must perform lifesaving surgery on a 15-day-old baby, and neurosurgeon Kenan Deniz operates on a patient suffering from debilitating headaches.

At Wales's biggest hospital, neurosurgeon George Eralil operates on a 19-year-old with a rare brain tumour, and vascular consultant Lewis Meecham faces a wave of emergency cases.