Platt visited Australasia in autumn 1961 on a British Council lecture tour. Platt gave lectures on malignant bone tumours (PLA/5/5/13), giant-cell tumours (PLA/5/5/14) and congenital dislocation of the hip (PLA/5/6/2). Platt also visited a number of personal friends and professional colleagues, and was awarded an honorary fellowship of the Royal Australasian College of Surgeons.
See PLA/10/2/8 for Platt's typescript diary of his trips to Bangkok and Singapore which he visited on the way to Australia. There are photographs of Platt's visit to Australia in the photograph album PLA/11/1/4.