Aye, it's so easy to put it back on. Like right now, for example, I am being very strict in terms of diet and am able to stick to it. That means no sugary snacks during the day, no breakfast (not necessary to skip this, but I can do without) and fewer carbs in the evening, also no beer at home. But while I can do all of this while having my target weight in mind, I know it will be super difficult, once I reach 12 stone, to not slip back into ordering a couple of takeaways each week or buying beer for home or eating some chocolate or crisps during the day.
Hopefully I will find the right balance. I'll continue with my 40/60km cycling per week, and 2-3 other sessions of sport, so hopefully I can afford myself a couple of treats a week and just maintain the weight... seems about right.