Mr Nicholls is a highly experienced children's surgery specialist with over 23 years in the field. As a father of four, he brings both sympathy and empathy to his practice, understanding the concerns of parents regarding their children's care. He has a special interest in neonatal and gastro-intestinal surgery, as well as inguinoscrotal surgery. Additionally, he provides vascular access for long-term parenteral nutrition or chemotherapy.

Mr Nicholls performs a variety of procedures, including appendicectomies, cholecystectomies, and fundoplications laparoscopically when appropriate. He also performs Percutaneous Endoscopic Gastrostomies for assisted nutrition. Among the common neonatal conditions he manages are Hirschsprung's disease, malrotation, atresias of the oesophagus and bowel, and necrotizing enterocolitis.

In his professional roles, Mr Nicholls serves as an examiner assessor for the Intercollegiate Specialty Board of Examiners in Paediatric Surgery. He is the Representative of the British Association of Paediatric Surgeons to the Royal College of Surgeons, a member of the Council of RCS, and the chair of the Children's Surgery Forum. He is also a Senior Journal Article Reviewer with the Journal of Paediatric Surgery, a visiting lecturer at Imperial College London, and an honorary Lecturer with St George's Medical School. Each year, he prepares 7-10 medico-legal reports.

Mr Nicholls treats a range of conditions including inguinal hernias, hydrocoeles, undescended testicles, and umbilical hernias. He also performs circumcisions and the release of tongue ties. His extensive experience and dedication to paediatric surgery make him a trusted specialist in his field.