To all those worrying about plateaus and slow losses please try to remember that this is a long game. We did not wake up one morning suddenly fat and we will not wake up one day suddenly thin (although wouldn't that be amazing. If anyone remembers the kids show 'The Queens nose' I'm still looking for the 50p piece that will let me make wishes).
Weight fluctuates up and down constantly by small amounts, it's affected by water, sleep, salt, heat, hormones and so much more) a slow week could just mean you're due on your period, or you did a bit too much exercise and your body is holding onto water to heal your muscles.
Hold firm, get a good nights sleep, drink plenty of water and give it time. If you keep following the plan you will lose the weight.