There's actually a school of thought that promotes the use of "cheat meals" to increase your fat loss efforts and keep your metabolic rate higher. This is basically planned overeating at certain times while keeping overall weekly calorie intake where it needs to be for fat loss.
The thinking is along these lines : restricting calories for too long causes your body to fight back and reduce your metabolic rate. This is a simple survival tactic because your body thinks a possible famine is on the way so it needs to hold on to your body fat and start conserving calories.
To overcome this effect and keep losing fat, you need to fool your body into thinking that plenty food is available again, and this in turn will pump up your metabolic rate again.
It's all apparently got to do with leptin levels in your body and how "strategically overeating" influences these levels. From what I've read it seems that one day a week pigging out actually contributes to fat loss
Try stay away from trans fats and high sugar content meals though

unfortunately for me my day off appears to have been yesterday (... and sunday ... and saturday )
You should realize a few things:
There's a difference between cheat meals and planned overeating.
Diets restricting calories are wrong. Sure, less calories means you'll lose weight over time because your daily intake is lower, but it has proven that once you start a semi-normal eating habit again you blow up. (I'm testament to that, yo-yo dieting)
Here's the kicker:
Eating more means you'll lose weight faster. Yes. Sit back... close that gaping jaw... and read it again. It's true.
Now by all means I don't mean eating more junk food means you'll lose more weight. It needs to be balanced. And you need daily exercise.
It speeds up your metabolism to insane heights. There is no such thing as a slow metabolism you can't get to work faster.
Reason for it is simple. As soon as you start restricting calories your body goes into starvation mode (same thing happens when you don't eat regularly, like breakfast/lunch/dinner at least). It will then take in and keep what it can while it's in that mode.
It takes around a week or two to condition your body to make it realize that it's definitely going to get food at certain times. (So much so you'll start feeling hungry close to the time)
Combine that with drinking enough water (which has the same effect, if you don't drink enough water your body will keep what water it can in your body) and cutting out sugar from your diet and a brisk 30min walk every morning.... you'll lose like crazy.
Cath, the 3kg's you lost is awesome, but don't get discouraged when it drops to around 1kg per week. Unless you workout daily for an hour on cardio at least, you won't be able to maintain that. You'll also notice it might be water weight (if you're drinking more water)
The most daunting thing of a diet is not to start one, but to continue one. I'll recommend Tom Vento's burn the fat feed the muscle book.
It's not about body building and has useful tips on emotionally and mentally preparing for a task like this. He goes through everything, how sugar affects your body, why it's important to drink more than the recommended daily glasses of water etc.
You can even use the NLP techniques he teaches in every day life, so definitely a great book.
One of the things he teaches is self-speak (NLP). To not tell yourself "I'm going to lose 10kgs this month" because your sub-conscious recognizes the "I'm going to lose" bit. Changing it to "I feel thinner and fitter already" is a more positive self-speak method.
a friend of mine followed his diet (BT6LW, you can find posts from him here) and he eats and drinks like there's no tomorrow. 1 hour gym every day consisting of mostly cardio and he has lost a **** load of weight.
Aim for 1kg a week. That's a healthy slow way of getting rid of the fat. Try not to cheat at all. 1 chocolate could mean your body retains more water and have a bigger "dip" on the "down" when the sugar wears off giving you more chance of falling flat on your face in terms of goals (and Tom goes into detail about goal setting which is awesome!)
good luck