Buckingham Palace has announced the King's first public engagement since . On Thursday, he was admitted to the London Clinic for observations after . He was forced to postpone a trip to Birmingham on Friday.

But aides have since revealed as they confirm his first public engagement of the week. On Thursday, the King will celebrate the 80th anniversary of the Mission Aviation Fellowship (MAF) the humanitarian air operator, which flies to 14,000 remote destinations offering support to isolated communities.

On his visit to RAF Northolt, he will unveil the charity's new Cessna 208 Caravan aircraft that will deliver aid to remote regions in Papua New Guinea (PNG). Charles will also meet members of the PNG community in celebration of their 50th Anniversary of Independence.

The King is expected to hold several engagements this week, including investitures at Windsor Castle on Tuesday. He is also expected to carry out regular state duties and private meetings, as well as .

But it is understood that a couple of appointments will be rescheduled to ensure the King has enough rest before flying to Italy next week for a four-day state visit.