I have a stone to loose. Last month I have:
Cut out most alcohol,
Cut out bread, pasta, biscuits, crisps and crap generally
Have protein smoothly for breakfast, soup for lunch, healthy high protein low carb dinner
Have been doing exercise 3-4 times a week (good mixture of spin, strength, etc).
Probably been eating between 1200-1500 calories per day, all if which are good calories.
Not lost an ounce. 
Any ideas? This is a constant problem with me.