Just gone into the 'overweight' category

[Ponderingprivately]

ok, so the day has arrived where I have put on a couple of extra pounds and find myself in the overweight category according to the NHS BMI for the first time. I am actually quite upset about this although I know that isn't very useful. My BMI is 25.9 so I know now is the time to deal with this before it is anything more.
I am 71.9 kilos and 166.5cm tall, I have struggled to lose weight since my second child was born 18 months ago, and have put on 1.5 kilos since May last year.
Where do I begin to lose weight successfully? I don't feel I would be successful if I cut carbs entirely from my diet. I have already begun the c25k programme and am making good progress, and I walk a lot.
I have a terrible sweet tooth after meal times and really struggle with my self control here.
I would appreciate ideas to kick start a reasonable weight loss, thanks MN.

Exercise won't do everything unfortunately. I would log what you eat for a few days and really check portion sizes as these can really creep up even if your diet is generally healthy. I lost 4kg since Christmas with exercise (30 day shred and running), dry January and being more aware of portions. I still had some desserts but not often. Cereal and cheese portions were my biggest shock! Trying to eat about 1600kg/day more or less but definitely check your BMR first.

I'm starting from borderline obese so more to lose...

thank you random, I don't actually drink so it's not that, but portion sizes could be the issue! My friend suggested that I eat off of the toddler ikea plates to control this so I may try this approach.

Toddler eating habits aren't easy - I tend to snaffle unwanted food as a means of makung it desirable to little miss fussy, which is less of an issue for broccoli but more of an issue with the biscuits required by the milk ladder!