Rising global tensions have prompted a growing number of survivalists in the United Kingdom to invest in home freeze-drying machines that can preserve food for up to 25 years. These devices, once mainly used for space travel and high-end dining, are now being adopted by so-called 'preppers' who want to build long-lasting food stockpiles in case of major emergencies.

Freeze-drying, formally known as lyophilization, removes up to 99 per cent of water from food by freezing it and then using a vacuum to turn ice directly into vapour. The method preserves flavour and nutrients while dramatically extending shelf life. A technique dating back to the Inca civilization, it can be used on a wide range of foods including meats, dairy, eggs, fruits and even complete cooked meals.

While small consumer models are available at relatively low prices, more powerful home units can cost around £3,000 and are capable of preserving large quantities of food each year. Enthusiasts say the investment is worthwhile, comparing the cost to that of a household refrigerator and praising the ability to store everyday meals without altering recipes.