The main difference being MFP allows you to 'earn' back calories for exercise, whereas the NHS one already allows for physical activity. I have also found MFP to be a little bit on the low side calorie wise, especially as it's quite difficult to accurately guage how many calories are burned by exercise.
But as you rightly say, at the end of the day, it's trial and error to find your own personal calorie range that works for you. I would suggest starting towards the higher end so you have 'some where to go' as you lose weight. π
I know that by eating too little when I used to, you end up with body fat and putting weight on quite often so I would start with the NHS bmi calculator. I have done this and lost 2 1/2st and I don't even exercise. When I used to go by the amounts of the mfp I never lost anything and put weight on at times. If you don't eat enough your body thinks you are starving it and turns what you do eat into body fat and this weighs more than eating the extra calories does so it stops you losing weight and sometimes puts weight on instead. Good luck with your journey.
Thank you HubbysMissMouse . I've gone straight in at the middle amount working on the theory that I can move up or down if needed. Early signs show this seems to be working- the weight is coming down already, but slowly, and that's just the way I want it xxxx
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