Hi Debbie,
I had my operation at Derby too. I followed the pre-op diet (mine was a liquid diet) for two weeks and everything was fine. You don't know if your liver has shrunk - just follow the diet that Derby has given you and all should be fine.
There's a thread for people who have had their operations at Derby at
http://www.lapbandtalk.com/f85/who-b...ospital-69940/
You've made a great start with your weight loss and exercise - well done.