You might have got away with it (and hopefully so) but frost free is a description which belongs on the planet of the Expenses Fiddlers.
The so-called frost free fridges in the main rely on a heater element to melt the FROST/ICE which forms from the freezing process. The heater element cycles on and off in the background but when things go wrong (as they can do) that heater element can remain on longer than intended - such as when the door is left open or is prevented from closing properly possibly because of over filling the compartment with food.
The heater elements can and do burn out, hopefully without setting fire to your property. You would expect that all new UK sold fridges in this day and age would be fail-safe in all respects but ... hmmm.
