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The expectant Duchess of Cambridge has been admitted to London's King Edward VII Hospital, which has a long association with royals.
The Queen left hospital after spending just 24 hours being treated for symptoms of gastroenteritis.
The Queen continues her recovery in hospital after she was admitted with symptoms of gasrtoenteritis, Buckingham Palace said.
Britain's tallest policeman, 7 feet 2 inch PC Anthony Wallyn, was among the officers standing guard outside the Queen's London hospital tonight.
To the delight of the photographers gathered outside King Edward VII Hospital, he was partnered by the smallest officer in the Met's Westminster Borough Support Unit, PC Tony Thich, who measures 5 feet 6 inches.
PC Wallyn, who wears size 17 shoes, said he gets "100-500 requests for a photo" every day, and hopes he may be able to add one with the hospital's most notable current patient.
"It would be a nice photo," he joked of the chance to be snapped next to the 5 feet 4 inch tall monarch.
The Queen's illness has forced her to withdraw from a number of engagements in a typically busy schedule this week. They include:
- A trip on Monday to visit HMS Lancaster in London.
- A reception at Buckingham Palace for MPs and MEPs on Tuesday. The event is now most likely to be hosted by another member of the Royal family.
- A two-day visit to Rome with the Duke of Edinburgh, which was scheduled to begin on Thursday.
The Queen awarded a medal to an employee at a private ceremony before she was later driven to King Edward VII Hospital in London.
Before her admission for treatment for gastroenteritis, the 86-year-old presented a female member of staff an award for long service at Windsor.
The King Edward VII Hospital won't be providing an update on the Queen's condition soon. She's unlikely to want visitors in order to keep disruption to a minimum.
The Queen will probably be treated with a drip and isolated during her treatment for gastroenteritis, a medical expert has said.
Professor Christopher Hawkey, at the University of Nottingham's faculty of medicine and health sciences, said:
The likely cause with the Queen is the norovirus, the winter vomiting virus.
It's very infectious and strikes in winter because people are indoors and it spreads more easily.
Because it is infectious we try to not admit people to hospital as it can start the outbreaks we hear of.
But not everyone can keep up with oral hydration so it is pretty routine to go to hospital and have a drip and wait for the thing to pass and keep yourself hydrated.
The Queen is being treated in hospital for gastroenteritis, an infection of the stomach and large intestine.
The two most common causes of the illness in adults in England are the norovirus and food poisoning, according to the NHS. Common symptoms include vomiting, diarrhoea and dehydration.
It is not yet known if the Queen is suffering from viral or bacterial gastroenteritis but it is unlikely she is being given antibiotics as this prolongs the time it takes to settle the condition.
The Queen is in "good spirits" and "good health" besides the symptoms of gastroenteritis, her spokesman has said. He added:
This is a precautionary measure. She was not taken into hospital immediately after feeling the symptoms. This is simply to enable doctors to better assess her.
The Queen's sickness was first announced on Friday, and she spent yesterday resting at Windsor.
Her Majesty had been due to attend a Welsh military celebration in Swansea during the country's St David's Day celebrations on Saturday, but was forced to cancel the plans.
The Queen, who is 86, has undertaken a number of engagements during the last week.
On Tuesday she met the Archbishop of Canterbury at Buckingham Palace, and on Thursday she presented a host of Olympic stars with honours during an investiture ceremony.