Hi Yoko
I am from the UK too and was banded in July this year.
You shouldn't expect too much from your band before the first fill unless it was filled during surgery, which isn't a common occurrence but does happen. Before it is filled, your band should allow you to eat pretty much as before, and you should just concentrate on maintaining the weight you have lost for the time being.
Do you have your first fill booked? If not, get it organised for as soon as possible. This is usually between 4 and 8 weeks after surgery, depending on the surgeon.
I had to wait nearly 10 weeks for my first fill and it was very hard work indeed! Even then, I didn't notice any difference and had another two weeks later. It's all a bit hit and miss as to which fill will give you the restriction you need. Some people only need one and others can go 4-5 before they notice a difference.
Hope this helps and best of luck