Thank you for the TDEE link! 
It says to maintain I need 2016 calories per day, and the guidance seems to be for a 1lb a week weight loss I should be working to a calorie deficit of 500 per day and for 2lbs a week loss a deficit of 1000 a day. so that would seem to fit with the MFP given target of 1200 per day? I get little exercise at the moment and have a sedentary office job