Sebastian, 16, whose father Rev John Hill served in the Navy and died in 2010, asked if Harry did anything special to mark the day of his mother’s death or her birthday.

“Yes, we do lemon drizzle cake,” Harry responded. “I think traditions are really, really important, especially when they’re sweet.”

Joshua, 21, whose father Lance Corporal Christopher Bradshaw died in November 2011 in a road crash, asked: “When life takes its toll and things get tough, what do you do to de-stress and relax?”

The duke replied: “Exercise is universally good for helping with grief, stress, loss.”

“Whether it’s going for a walk through nature, taking the dog for a walk or swimming in the cold sea – I love that – just to get yourself out and moving.”

Harry said that “it’s very easy to sit in your grief, to sit in your stress” but he had learned that it was better to do something – talking.

“Guys, if you’re feeling it, share it.”