Prince Harry has paid tribute to his late grandmother, Queen Elizabeth II, on the third anniversary of her death as he returned to the United Kingdom for a short visit, which has also sparked speculation over whether he might meet his father, King Charles III.

The Duke of Sussex, who lives in California with wife Meghan and their two children, has come back to England for several charity engagements this week.

His last trip to the country was in April to challenge the British government's decision to downgrade his level of taxpayer-funded security.

Harry, 40, made the transatlantic trip to attend the annual WellChild Awards in London on Monday evening.

The charity, which the duke has been a patron of for 17 years, supports seriously ill children and their families.

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