I'm interested in loosing a tone of weight quickly how much weight would an all meat diet lose?

Not good. No one can tell you for sure but doing that will 1) introduce extra animal fat into your diet, 2) raise your cholesterol (only found in animal products), 3) deprive your body of essential nutrients not found in meat, 4) put an extra protein load on your kidneys, 5) deprive your liver and brain of sugars which are needed for metabolism. All meat diet is not a good idea.