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The Wellington Hospital in St John 's Wood , North London is the largest independent hospital in the United Kingdom , and part of HCA International hospital group .. London. London. It is known for its cardiac services , neurosurgery , liver and HPB medicine , rehabilitation , gynaecology , orthopaedics , and other services .. The Wellington Hospital has four main sites  : North Building , South Building , Central Building and the new Platinum Medical Centre .. The Wellington Hospital , The Platinum Medical Centre and The Diagnostics & Outpatients Centre at Golders Green conduct diagnostic services including  : Magnetic Resonance Scanners -LRB- MRI -RRB- , PET CT -LRB- Low Dose , Dual Source -RRB- , 64 Slice CT scanner , Digital Radiology , Interventional Radiology Lab , Ultrasound -LRB- multi-use -RRB- , Cardiac imaging & Research Centre -LRB- CIRC -RRB- and Pathology Services .. PET CT. PET-CT scanning. Radiology. Radiology. Ultrasound. Ultrasound. Pathology. Pathology. The most recent addition to The Wellington Hospital is the new Platinum Medical Centre , which opened on 3 May 2011 .. The Platinum Medical Centre houses a diagnostic and imaging centre with PET CT and two MRI scanners together X-Ray , ultrasound and cardiology diagnostics .. PET CT. PET-CT scanning