Prince Harry was "relieved" by the reaction he received from fans upon arrival in the UK, according to a body language expert.
Psychologist Judi James said that there was a clear change of emotion from the Duke of Sussex when the crowd outside St Paul's Cathedral cheered him.
Yesterday, the Prince attended a thanksgiving service at the venue for his Invictus Games charity which is celebrating its 10th anniversary.
Those awaiting his arrival cheered when he stepped out of the car.
Prince Harry met the crowd who were awaiting his arrival at St Paul's Cathedral
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Grinning, Harry shook hands with the hundreds of people stood outside as he made an impromptu walk about.
James said the royal's "body language announcement rituals" included "bending towards the crowd and hunching his shoulders to avoid giving the impression that this was a scheduled event".
She said Harry "stands away and leans in from a distance rather than making it more of a royal, immersive form of greeting and chatting".
“[His] lack of body engagement probably [gave] him the option of a face-saving exit if his reception [was] less than warm,” James told the MailOnline.
Crowd gathered awaiting to catch a glimpse of the Duke of Sussex
PA
Prince Harry appeared "relieved" according to Prince Harry
PA
“Harry’s wreathed grin with eye crinkling suggests he might be excited and relieved to meet fans in the UK.”
The Duke of Sussex was joined at the Invictus celebration by lose relatives of his mother Diana, Princess of Wales and a mentor who supported him after her death.
Hundreds of others from the “Invictus family” were also in attendance.
The Prince is understood to have also invited other members of the Royal Family but none were present at the ceremony.
Yesterday King Charles was busy meeting guests at the first Buckingham Palace garden party of the year.
The monarch and his son have not met during Harry’s brief UK visit due to the King’s “full programme” said Harry’s spokesman in a statement.
There have been reports of issues of trust but the statement had a conciliatory tone and mentioned how the duke hoped to “see him soon”.
The spokesman said: “In response to the many inquiries and continued speculation on whether or not The Duke will meet with his father while in the UK this week, it unfortunately will not be possible due to His Majesty’s full programme.
“The Duke of course is understanding of his father’s diary of commitments and various other priorities and hopes to see him soon.”