At Royal Papworth, 54-year-old Shelley undergoes one of the most complex and extraordinary operations imaginable - a pulmonary endarterectomy. At Addenbrooke's, a new procedure has been devised to help cancer patients with weakened bones.

This edition focuses on marathon operations. At Royal Papworth, 59-year-old Kevin is having a chest wall reconstruction that will take at least 12 hours. At Addenbrooke's, 47-year-old Gulraiz is having a rare brain tumour removed.

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