(BBC News) with David Austin

Disaster officials in Pakistan say the number of people affected by the severe flooding in the country has increased dramatically to 12 million. They said the figure was for just two of Pakistan's four provinces - Khyber-Pakhtunkhwa and Punjab. A United Nations official, Manuel Bessler, told the BBC that there was now a strong risk of disease.

"All over this polluted water, we have temperatures between 35 and 45C. We have civilians exposed to these elements, mosquitoes all over the place. This is an ideal environment for them to spread these waterborne diseases."

A week after the British Prime Minister David Cameron ignited a diplomatic row with Pakistan by accusing it of not doing enough to fight terrorism, Mr Cameron has held talks near London with the visiting Pakistani President Asif Ali Zardari. The two agreed to intensify their cooperation on fighting Islamist militancy. Here is Reeta Chakrabarti.