This portrait has been done to celebrate the 100th anniversary of the opening of Australia House in London - our first overseas diplomatic mission. George V laid the foundation stone (well he unveiled the plaque on the stone) in 1913. Charles is attending the celebrations today and unveiling a commemorative plaque to the 100 years of the building. He is with the Australian High Commissioner to London.
Sunrise (Channel 7 morning show) has been showing clips of Charles and Camilla's arrival and the unveiling of the portrait, and then the reception. They are also celebrating his 70th birthday. In the speech he referred to Harry and Meghan's baby's name by suggesting 'Kylie' or 'Shane' may make the 'shortlist' but not 'Edna' or 'Les'. Of course these are names associated with TV characters from Aussie TV shows or Dame Edna Everage's character.