If your beko f/f is a frost free model & you have problems with freezer temp, it could be defrost timer not activating defrost cycle. i have repaired several in recent months with same problem. Try switching cabinet off for atleast 24hrs to defrost cabinet & restart. If freezer reaches temp after this, it will confirm defrost problem which should cost in region of £60 - £75 to rectify. hope this helps.
Hovis0904, January 2010