I did a Christian course called New ID (New Identity) which was pretty helpful. It is about overcoming eating disorders. It is available in London, Cheltenham, Birmingham and about half a dozen other places. I believe it is free, it does deal with under eating (like anorexia) and also Bulimia and compulsive eating.
www.newid.info/
I am an impulsive eater and so when I stop going to a slimming group I put the weight back on. I found New ID helpful, has anyone else done it?