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The Queen has attended the Chelsea Flower Show, the latest of several appearances that have helped to ease public concerns about her health ahead of a national celebration of her seven decades on the throne.
The 96-year-old monarch was driven around the Royal Horticultural Society's annual festival of garden design in West London in a buggy on Monday, saving her from having to walk around the show's attractions.
Early next month Britain will honour Elizabeth's Platinum Jubilee with four days of pageantry and celebration.
Buckingham Palace has previously said she intends to attend a number of different events.
Last week, the Queen made a surprise appearance at the opening ceremony for a new rail line in London and the week before attended a horse show in the grounds of her Windsor Castle.
Earlier in May she missed her annual address to parliament, with the palace citing episodic mobility issues.
Her eldest son and heir to the throne, Prince Charles, stepped in and read out her speech.
Until recently, Elizabeth had not been seen often in public following a night in hospital in October last year for an unspecified illness.