Hi Gemma
A friend of mine has been a WW always, lost her weight from kids etc no prob but recently gained a stone. She had been similar to you, lose a pound, gain half - although she did say she thinks it would shift quicker if she was 100%. She has now swapped to slimming world and she has 7lbs to go. She lost a pound last week and her weigh in today, will let you know how she gets on. I think when you are so close, your body doesnt want to part with any more weight easily
Good luck though - im sure you will be fine esp as you been 100% xx