Firstly, congratulations on your weight loss so far. It isn't easy, and a 10lbs loss is an achievement - irrespective of whether it took you 10 days to 10 months to lose it.
In January 2016 I also weighed around 21st. I had tried every diet plan going over the years, including (but not limited to) Cambridge, Exante, WeightWatchers, 5:2 and plain old trying to eat more healthily. With each diet, I would do OK for a while but then end up reverting to former eating habits & put the weight back on (usually with interest). The most successful of these diets was Cambridge, where I lost 5st.
For me, what I needed was support - a whole group to keep me motivated through the crappy weeks (and there will be crappy weeks). I joined a Slimming World group in January 2016 and it is no exaggeration to say it has changed my life (no, I don't work for SW). I have lost almost 7 and a half stone to date, and have lost this at a steady rate over 14 months. I am now just over a stone away from my ideal target weight (ideal for me, healthy BMI etc.)
The reason that SW has worked for me (I think) is that although they tag it as "food optimising", it is basically healthy eating. Unlimited fruit, vegetables, lean meat etc., with treats like chocolate, crisps and alcohol in moderation - if you want them at all.
The thing is that you have to be able to view weight loss as a permanent change of lifestyle/attitude to food. A plan that is basically healthy eating, such as SW, is much more likely to become your new "norm" and help you create healthy habits for the rest of your life than something more drastic - such as Cambridge.
I have heard about some very odd advice being given by SW Consultants on MN - however, my own experience has been nothing but positive.