Bird flu could cause the price of Christmas turkeys to rocket this year, with organic birds likely to cost more than £100.

As many as two million turkeys are now regarded as at risk following an outbreak of the deadly H5N1 strain of bird flu at a Suffolk poultry farm.

Prices have already risen sharply this year because of the spiralling cost of wheat feed. It makes up two thirds of the diet of farmed turkey and costs 70% more than two years ago.