Everyone is concerned about the health of the Duke of Edinburgh after he was taken to hospital with a bladder infection, Prime Minister David Cameron said today.

Mr Cameron said he was sure the Queen and the Duke would have gone ahead with Sunday's river pageant in torrential rain regardless of the risks to their health after the day's exertions - spending four hours on the water - were blamed for his turn of ill-health.

Speaking to Sky News, Mr Cameron said: "It was a most extraordinary spectacle and obviously everyone is very concerned and worried and wants to know that (the Duke) is going to be OK.

"The thing about our Royal Family is that they are incredibly dedicated to what they do and they are incredibly dedicated to doing it, no matter what the circumstances.

"I don't know all the conversations that took place but I would be pretty certain that Her Majesty and the Duke of Edinburgh would have wanted to do what they did and would have carried on doing it."