The ideal temperature for a fridge in the UK is between 0°C and 5°C. The Food Standards Agency advises household fridges to be set at 5°C or below because harmful bacteria grow best in what is known as the ‘danger zone’ between 8°C and 63°C. It is important to keep the fridge temperature within this range to store chilled food safely and prevent food waste. If the fridge temperature is too high, harmful bacteria can grow rapidly on food, which can cause food to spoil quickly and potentially lead to illness. It is recommended to use a fridge thermometer to ensure that the temperature is accurate. If the fridge temperature is too low, it can cause food to freeze and lose flavor and moisture. Therefore, it is important to set the fridge temperature between 0°C and 5°C and use a thermometer to ensure that the temperature is accurate.