How's it all going travellingwilbury? The approach you're taking is how I lost weight - I definitely recommend it. I lost 2 stone over six months or so more than a year ago, and have kept the weight off.
India Knight's book is pretty good, and I pretty much followed that, at least to begin with. The first two weeks are hard going - but less hard than I'd expected. After the first couple of weeks I did reintroduce carbs, but in much more limited quantities than before - so I didn't feel deprived. It's all a question, I think, of 'retraining' yourself, and not automatically reaching for the cake or piling the plate with pasta or roast potatoes.
Nowadays I feel as if I eat more or less what I want, but with thought and care - ie small portions of spaghetti, big portions of the sauce that's going with it. As much cheese as I want, but only one or two crackers, not half a pack. And I have managed to break my crisp habit (although I can't give up biscuits entirely!)
Another thing I find helpful is to eat fewer carbs later in the day. So I sometimes have a sandwich at lunchtime (tho not every day) but just meat or fish and vegetables (and cheese and nuts for snacking) in the evening.
Some non-carb lunch ideas: tuna or chicken salad, smoked salmon and cream cheese, omelettes, soup made with green vegetables.