I am absolutely determined to do everything possible to extinguish the disease Nick Brown Agriculture minister

It brings the total number of confirmed cases to 163. An estimated 30,000 carcasses are still waiting to be destroyed.

Opposition MPs have criticised the government's handling of the outbreak. Conservatives say Britain is facing a national emergency and in Dublin they are calling it a scandal.

This morning, 70 cattle were slaughtered on a farm in the North Kent marshes after foot and mouth was diagnosed. The virus may have spread by air from across the Thames in Essex where the first case was identified.

Kathy Maclean and her husband run the farm next door. They are very worried. "It is just emotionally devastating," she said. "You can't begin to imagine. This is a beef herd that my husband has built up for years. He's a brilliant stockman respected all over the county and here we are two miles from foot-and-mouth."

Agriculture Minister Nick Brown was keen to play down today's bad news. He insists the outbreak is under control.

"It may be we are dealing with a disease outbreak that will have a long tail before we can get completely back to normal. I am absolutely determined to do everything possible to extinguish the disease," he said.

But fears are growing about the ease with which the disease seems to be spreading.

Conservative MP for Penrith and The Border, David Maclean said: "It now seems to be airborne and it's jumping from farm to farm apparently through the air. We may also have some evidence it's being transported on vehicle wheels possibly even milk tankers which would be a horrifying prospect."

Tourism is also suffering knock-on effects from the disease. The British Tourist Authority says it has been inundated with calls from prospective travellers asking whether it is still safe to travel to Britain.

Destinations like the Lake District have already noticed a drop off in visitor numbers. Estimates say it is costing the industry �100m a week.

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