Need some advice please

Hello ive been on MFP for a few months now and ive lost 4 kilos :O) but Ive lost 10cm from waist/hip's!!! its very important that you understand that your body need 1200 calories just to function.....meaning organs/blood/brain plus to get you moving to work !!!! if you stay at 1200 calories a day you will burn and lose weight.

Basically, no, it's not an ok diet. It's all processed. Where are your fruits and vegetables? And 850 cals is way too low.

You're not eating enough and you're not eating healthy. Check your calorie allowance with MFP and eat the amount that's suggested. I don't know how tall you are or what your activity level is but it should be somewhere between 1200-1500 cals.

Eat real food. Protein shakes are ok as a part of a healthy diet but certainly not as your (almost) only source of food. There's plenty of healthy stuff you can eat for breakfast and lunch that will fit in your calories allowance (eggs, oatmeal, salads, soups, sandwiches, grilled chicken...). You definitely have to add some fruit of veggies to your diet!

Lean cuisine meals are ok every once in a while but again, try to eat real food! The internet is full of easy healthy recipes that can be prepared quickly.

Tons of people on this site, me included, have lost weight by eating a reasonable amount of calories (i.e. NOT 850 cals). There's no reason to believe you are different!

It's not a healthy diet at all OP.

Sorry but where is your fruit, salad and veg?

Hi there. I understand the convenience of the shakes and the packaged meals, especially when your really busy but you could add to these and mix it up a little. If you're not a breakfast person keep the shakes for now, a shake is a good start to the day and better than no breakfast at all. You might even add some fruit like banana and make it a banana smoothie. Then you've had a piece of fruit before you know it.
Instead of another shake at lunch everyday, maybe try a salad or a salad sandwich? Mix it up a little the body loves change it keeps it on its toes and it keeps its metabolism moving. If you track your calories on mfp you will know you are low at around 850 cals. So add a snack or two. Most people say you should eat every 2-3 hours so I think you need some snacks between each meal and that will also boost your metabolism - a win a win for you - eat more burn more calories lose more weight.
These are little changes I added over the last 9 months and it was gradual.
It sounds like you are doing it really strict and low calories which with a little adjusting here and there you could see some great results.
Good Luck with your choices and congratulations on making the choice to change your eating habits!!

Fruits: Apple, orange, banana, small bunch of grapes. Each of those is around 100 calories.

Veg: Carrot sticks, celery, tomatoes, cucumber, peppers, radish, lettuce, spinach. Eaten raw you could have a huge plate of any of those for under 100 cals.

Avoid too much dried fruit like raisins, and go easy on the avocados - full of good fats, but dont have too much.