Gorgon, no, not 'nasty', factual. I'm much better at being 'nasty' than that! 
It wasn't 'intended' in any way other than to say that it's quite easy to be, like me, quite evangelical about our epiphany and our 'stone lost in x weeks' narrative (I'm at about 11 lbs lost in 3.5 weeks). It's good to hear that people are trying to reign back at the first signs of weight gain, as we all know it's far better to have never become overweight in the first place. That often has its roots in early childhood.
I'd imagine every person on here who's ever stuck to a diet for more than a couple of days can tell a story of their initial success.
Very few, sadly, can tell us of how that weight stayed off for a year, let alone forever. Statistically, there's every reason why gorgon and I are likely to fail to keep that weight off. And I'm sure that every single person who ever decided to lose weight told themselves that 'This it it. I'm going to lose this stone/5 stone/15 stone for good this time'. A stroll down any high street tells you the reality.
The psychology of weight gain and loss is way more complex that 'eat less/move more' (and I realise that walking hasn't said otherwise!).
That's not to say that gorgon and I will definitely fail. And yes, perfectly willing to return in a year, but am realistic enough to say something like 'Yes, the 8 weeks were hard work, but I lost 1.5 stone, I felt great all summer, but by Sept half a stone had crept back on, then we had a huge family upset/celebration/illness (insert life event) and before I knew it, I'd put a stone on, so I started my diet again and so far have lost 4 lbs'.
And repeat. That', statistically, is the most likely scenario. 
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And good luck with your progress, walking!