Don't want to cast a shadow on your New Year, but extremely low calorie diets aren't healthy and don't last. What works best and lasts is changing your diet to what you're going to eat permanently so the changes in metabolism that follow stick around. Dieting in general has not proven to work long-term and can be unhealthy, what does work is to change your regular diet and watch the weight slowly but permanently come off with the addition of exercise. And if you're breast feeding, be very careful about cutting calories, as you're still eating for two. To the steady go the rewards that count. Good luck!
Thank you so much for your advice, I will most definitely be following it as I what a lifestyle change rather then a diet! I'm not in any rush , are there any things you recommend I don't eat ? Obviously fatty sugary foods x