I had good success for 3 months when I managed to get rid of 5Kg.
Stop my "just before bed" cheese sandwich!,
My lunch is gone from bread and cheese, etc to a bean curry thingy (my wife is disgusted by that!)
Stop going to Asda (next door to work) for an afternoon snack.
Stop eating up the excess food after the kids (yet again) reject a perfectly good dinner
In summary cut down on the fat/carbohydrates and
be disciplined by avoiding eating between the three main meals (that is the key one)