No weight loss for over 3 weeks

Well done for sticking to your calories, I would try and eat more fruit and veggies and eat more refined foods, like wholemeal bread instead of white and wholegrain cereals instead of Frosties and perhaps try and drink more water? Well done on your loss so far though. I know how hard it is to plateau, I do it all the time and I found out it is due to health complications, perhaps see a DR as well just to make sure everything is ok?

Well done on the 7kg lose, it might be worth recalculating your goals and see if your calorie allowance changes.

harden up. just wait a minute.

If it is an option, I would gradually move away from processed food and do more cooking.
As much as you can - measure what you use and try and include everything (not always possible I know)

I would definitely try dropping the fizzy drinks if you can - If I want a bit of a lax day I'll throw in a can at the weekend, and try and drink more water (which I HATE, so it's a real force to get 4 glasses down in a day!).

Bring in some fresh veggies and fruit but well done on your losses so far.

If it is an option, I would gradually move away from processed food and do more cooking.
As much as you can - measure what you use and try and include everything (not always possible I know)

I would definitely try dropping the fizzy drinks if you can - If I want a bit of a lax day I'll throw in a can at the weekend, and try and drink more water (which I HATE, so it's a real force to get 4 glasses down in a day!).

Bring in some more fresh veggies and fruit but well done on your losses so far.

Switch to a diet based on real foods, almost everything you eat is processed, there is little fruits and veggies, loads of sugar and probably low in fibre. Get rid of the sports drink and eat a more substantial, wholegrain breakfast for a start. Aim for nine portions of fruits and vegetables a day, three portions of reduced fat dairy, oily fish several times a week, a small portion of protein at each meal and snack, only whole carbs, junk/ processed/ sugary foods to comprise no more than 10% of daily calories which is one small snack.

When you eat right you can do better quality workouts, recover faster, have all the nutrients associated with lower bodyfat (eg. calcium from dairy, omega-3s from oily fish) and health. Research suggests a proper breakfast will help you make better choices and naturally eat fewer calories through the rest of the day. There is no poiint in tracking sodium unless you check the entry of every food you eat because it's not on many of the listings, there is quite a bit of sodium in sweet biscuits/ cookies and breakfast cereal,

from looking at your fitness diary id suggest dropping some sugar and eating more healthy carbs from natural sources

Well done so far m8, try some Fruit n veg . snack on apples an plums, and drink more water or try the Zero drinks like 7up, sprite, fanta, and coke zero. if you must have the juice.
if you have loads of fruit and veg and say chicken or turkey with each meal, you would struggle to be hungry and im pretty sure your weight would shift a gear.

Increase your calories.

Looks like another good candidate for the roadmap, this has worked for many people.

http://www.myfitnesspal.com/topics/show/654536-in-place-of-a-road-map-2-0-revised-7-2-12

Running is great, keep doing it! I feel a million times better since I started running. But make sure you're mixing it up - definitely do weights if you aren't doing any already. Personally, I like compound exercises that work lots of things at once (good time-saver).

Mostly I think it's diet though. Sugar is a killer, I'd highly recommend dropping the Lucozade in particular. It's just awful stuff. If you need a boost before working out go for something with some nutritional value. Protein powder is also high calorie for what it is, and unless you've just had a heavy weights session I'd say drop it and go for chicken or fish. Real food is always preferable to supplementation.

Get more veg too. Assuming it's not deep fried, you can't really go wrong with upping the veg.

First, it isn't a race. Yes, we like to see progress every week and we like to see it fast, but what we like and what actually happens are two different things.

It isn't unusual to have a fairly rapid loss that meets our schedule and then suddenly have very little happen on the scales. Stop focusing on the weight.

The weight is the symptom, not the problem (and it probably did not just happen overnight).

Second,you could have some inital weight loss that is a combination of water, fat, and yes, muscle loss. But when we get active, the muscle loss will be pretty short-lived because your body is scrambling to figure out what happened. Why the change (all of a sudden) is what your body is wondering. It was in some other equilibrium and you changed that. And it may fight you to keep doing what you had been doind and maintaining that weight. Evidence suggests this is what happens with a large decrease in calorie consumption to trigger weight loss even if it is accompanied by physical activity.

Third, given your diary it could be that you are on a muscle build given how much protein you seem to be consuming. Yes, I have friends that swear by protein supplements and I know there are some studies that show that a slight increase in protein after workouts and now seemingly more importantly just before bedtime may help muscle repair and burn rates. But then again, they workout at the gym with weights on a rotation program for different muscle groups and I'm more of a cardio guy. But I can run up the 5 floors in our building and not be straining to breathe and they are huffing and puffing.

Lean.

Fourth, take a look a look at what you are drinking. Yes, I know I drink coffee. I have cut back my sugar and cream intake and have given up the flavored creamers. But I have given up carbonated drinks. Just lost my taste for them as a caffeine, phosphoric acid, carbonic acid and sweetener delivery system.

Finally, my weight loss was a relatively straight line at first but then was a series of plateaus with fairly dramatic drops after several weeks or months even though I kept doing what I was doing. Even though my weight wasn't changing (remember it is a symptom), other measures such as how my clothes fit, my physical endurance, etc. were changing. I had a one year long plateau in 2011 where I just kept going even though my weight really did not move. But my clothe sizes were...down 4 inches in pants waist size, down another inch in neck size, moving from a L/XL size (depending upon which piece of clothing we are talking about) to the point where L was really too large.

This year was the final drop with a very small adjustment in physical activity and adjustment of food intake.

Yup get a HRM I bet you are overestimating your calorie burn!

It's possible you are adding muscle and losing fat, which would keep your weight about the same. Take measurements!

I took a look at your food diary, and I have some suggestions. I hesitate to critique anyone's habits and diary, but since you asked here are my thoughts. I suspect you are over-estimating your calories burned at the gym. I read your comment about how you estimate the calories burned, but I suspect something is off in the calculations. Unless you are working for 1.5-2 hours, I doubt you are burning 900-1100 calories.

Some other thoughts:
- I noticed that you drink a lot of diet soda. I used to do that too and I didn't lose any serious weight until I stopped.
- I would suggest more water, fruits and vegetables and see if you notice a difference.

Again, I hesitate to comment on anyone's diary, please do not take any offense. Good luck!