The Queen missed the ceremonial welcome on Horse Guards Parade but attended the lunch and Picture Gallery exhibition staged for the Emir of Qatar.

It was only the princess’s third official appearance since she announced in September the completion of her chemotherapy treatment.

Showbiz royalty David and Victoria Beckham are attending their first state banquet at Buckingham Palace as they joined the King and Queen for the glittering affair in honour of the Qatari ruler.

Work and pensions minister Sir Stephen Timms said the move aims to drive ‘real improvements’ for disabled people.