Thanks everyone - I really do feel like I am happy with the way I look (within reason and with clothes on - I have had 2 dc after all
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I am now a size 12/14 and was a tight 18 before starting Dukan. It had been a slow weight gain, having never lost all my 'baby weight' after dd and getting pregnant again within 12 months with ds.
I was tempted to try and keep at it to get down to a size 10/12 but to be honest, at 5' 10", I have never been that slim and Dukan says I am now under my ideal weight, so happy with that. It has been amusing being back on the school run - lots of requests for my 'secret' and positive coments on my figure 
Dott Top tips, for what it's worth...
Drink loads
Eat really regularly, I am much more likely to cheat if I skip a meal and then realise that I am hungry
Get some sugar free gum and sugar free sweets
Sugar free ketchup has been a lifesaver
Make sure you only have veg on pv days with one meal, not every meal
M&S delli meats are great for lunchtime
If you really need a cheat, think Atkins - Cheese, a handful of nuts, Atkins crackers with butter (naughty, but sooooo nice)
Avoid alcohol if you possibly can - a glass of wine can so easily lead to a packet of crisps.
Always walk up stairs - if you are struggling to fit a walk in, do stairs at home for 10 mins
If you can afford it - buy a new pair of trousers at your current weight and smile when you have to give them to the charity shop when they are too big in a few weeks (this gave me a huge buzz)
I have oat and wheat bran in two Activia fat free yogurts every night for desert and this seems to get me through the evening.
For those of you who have stalled, Dukan says that it is more difficult in the Cruise phase if you have tried lots of diets in the past, but you will get there. It may just take a while for your body to realise that you mean business this time.