The Duke of Edinburgh will tonight attend his first public engagement since being discharged from hospital almost a week ago following treatment for a bladder infection.
Philip will chair the Senior Colonels' Conference at Buckingham Palace and host a dinner for the high-ranking officers in his role as Colonel of the Grenadier Guards.
The Duke has spent the week convalescing since leaving central London's Edward VII hospital last Saturday, where stayed for five nights.
He emerged looking in good health and nodded when asked by the waiting media if he was feeling better.
But he did not attend the Queen's Diamond Jubilee visit to Nottingham with the Duke and Duchess of Cambridge on Wednesday, and missed other events during the week.
Philip, who celebrated his 91st birthday last Sunday, will be seen for the first time in public tomorrow when he joins the Queen for the traditional Trooping the Colour ceremony.
The couple will ride in a carriage procession to the annual event, held in Horse Guards Parade, Whitehall, which marks the Queen's official birthday.
A Buckingham Palace spokeswoman would not comment on the Duke's health but said: "The fact he's attending engagements is an indication he is back to himself and able to carry out engagements."
The news came as an IPSOS Mori poll showed nine out of ten Britons were satisfied with the Queen and Prince William, with Prince Charles' ratings level at a record high of 78%.
Deputy Head of Political Research at Ipsos MORI, Tom Mludzinski, said:
“This poll shows the strength of feeling the British public have towards the Royal Family, with approval ratings politicians could only dream of.”