Speaking of the importance of the event, William said, “It’s fair to say the past few weeks have had a rather ‘medical’ focus. So I thought I’d come to an air ambulance function to get away from it all!

“But, seriously, we gather tonight to help as many as people as possible benefit from top class care in the silhouette of London Air Ambulance’s flying lifelines. As a former pilot for East Anglia Air Ambulance, I know just how vital the work of air ambulance teams across the country is, and the truly life-saving difference it can make to deliver urgent medical care wherever injury strikes can make.

“Here in London, the current aircraft have served magnificently. But our capital city needs a new fleet. And we are Up Against Time. The clue really is in the Appeal’s name. By September, we need the two new red birds – decked with the latest kit such as night vision – in our skies.

The prince was also seen talking with Ellen Convery, who used to be known as Ellen White and played more than 100 games for the England women’s football team.

While receiving treatment, King Charles will not be attending public events. Between treatments, he’s spending time at the Sandringham estate.

Details of the type of cancer he has been diagnosed with have not been disclosed with the public.

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