First week losses depend on a lot of factors but if you ate a pretty healthy diet before you are unlikely to have a big loss in the first week. Added to that you are already well within your healthy BMI range and it's bound to be slower. We are about the same height but your starting weight was my target weight and there's no way I could go as low as you are aiming.
Thanks for the replies, I have just updated my profile etc as it was wrong and out of date.
Can I ask though, does not drinking a lot effect weight loss? I really dont drink an awful lot at all. Probably 1 ltr of fluid a day