During a packed day of engagements, Camilla hosted an event for survivors of domestic abuse and she and Charles also tested their baking skills.

Sinn Féin’s Ms O’Neill previously met Charles when he visited Northern Ireland in 2022.

King said he decided to make a documentary on the day, after celebrating the 32nd anniversary of their friendship and 23 years working together.

The Times newspaper reports Harry has told friends he would step into such a role while Charles is unwell.

The author criticised the accessibility of ‘killing machines’.