The new National Pandemic Flu Service, established to provide internet users with Tamiflu scripts without seeing a doctor, crashed within minutes of going live on Thursday. It was receiving an estimated 2600 hits a second and 9.3 million hits an hour, forcing the Government to immediately announce increased capacity for the site.

The British chief medical officer defined children under 14 as "super spreaders" as 100,000 people became infected with the H1N1 virus in the seven days to Sunday compared with 55,000 infections the week before.

Up to 840 people in England are in hospital, and of these, 63 are described as being in a critical condition. Official figures state that 30 people have died of flu, and of these, 16 per cent were defined as healthy, while a further 17 per cent suffered from underlying conditions such as high blood pressure or diabetes.

The number of children under five who have been admitted to hospital has climbed to 169, and of these, 12 were known to be in intensive care on Thursday.