Just a general reply, not directed at u Julian, havent posted in here for years so a bit rusty
End of the day its all mental, overcome the need to constantly graze, or to overeat at every sitting and you are well on the way to controlling it. The gym is all well and good but its proven that 80% of weight loss is in what you eat, there is no easy solution.
For me the gym is a way to maintain musle mass and bone density, aerobics is fine for burning up energy but free weights are about the only way to maintain bone density.
Feeling a little hungry all the time is good for you, I would rather feel slightly peckish than bloated all the time.