The following are for your guidance with frozen food, though they are not a statement of the law:
When shopping, buy frozen food last so you can get it into the freezer quickly
Store the food according to the manufacturers instructions on the packet, having regard to the 'star' system for freezers and food
In refrigerators, the frozen food compartments will often operate to the 'star' system.
One-star frozen food compartments operate at -6ºC, 21ºF
Two-star frozen food compartments operate at -12ºC, 10ºF
Three-star frozen food compartments operate at -18ºC, 0ºF
Food freezers operate between -18ºC, 0ºF and -25ºC, -13ºF
Keep the food in its original wrapper until used
If you freeze food yourself, label and date it, so you know what it is and when to use it
In the event of a power cut, keep the door closed
To maintain proper temperatures in the freezer, defrost the freezer in accordance with manufacturers instructions
Unless you want to wake up to a freezer full of water don't let ice build up over the edges of the door/lid - it will stop the door/lid closing properly
Do not re-freeze food once thawed - bacteria will have started to grow in the food
Should you require more advice for your own business and any other matters relating to food safety and hygiene you should contact firstname.lastname@example.org
or your area environmental health officer.