"With regard to snacking, I guess it?s habit."
This is absolutely true. A conventional high carb diet means that we end up being hungry between meals, so we get used to snacking. Which means lots of extra calories! Once you're properly into low carbing, and you are ketogenically-adapted - i.e. you are in fat-burning mode - you really won't be hungry. So don't expect that snacks will be something you have to do.
"Processed food ? I hear what you?re saying, but I guess I?m having trouble thinking of what to eat. I am also catering for two pre-schoolers and a non-LCing DH! Therefore if they?re having sausages, I can?t really then cook a steak for myself."
I get you. But you need to think about cooking for all the family, and cooking the same thing. Low carb sausages (please tell me that the sausages you were cooking were low carb?!) are fine for all of you - but you need to reduce the amount of processed meat in the rest of your day.
"Also lumps of meat tend to be expensive."
Not necessarily. A stew made from shin of beef is cheap. Or chicken thighs. Or lamb breast. Or belly pork.
"My staple mince recipes all seem to include either tomatoes or potatoes. I like chinesey-type food, but that?s all soy sauce, brown sugar, sweet and sour etc."
There's a lovely low carb shepherd's pie on the recipe thread, that uses mince.
"The thought of eating plain fish every day is not very appealing"
Who says you have to eat plain fish every day?! The other day I cooked pan fried cod fillet with a choice of two sauces. A mushroom sauce, which I made with finely chopped mushrooms, fried with chopped shallots and garlic, with cheese and double cream.
"and generally speaking DCs and DH aren?t big green veg eaters. As it is I seem to spend my whole life in the kitchen, so I don?t want to make different meals every time." Of course you don't want to be cooking different meals. But I think the family are going to have to get better at eating green veg! What is it that they don't like? Lots of lovely things you can do with your veg. Do they like salad?
"Lunches have to be cold due to time constraints ? I make them in advance a lot of the time. So it?s salad with something. Tuna and chicken are OK? What else could I have if not ham, cheese, smoked salmon or mackerel or eggs (which I have for breakfast since I have to cook them for everyone else anyway)?" Nothing wrong with the options you have given here - just make sure you're not eating processed meats/fish more than once a day. How about making a frittata? There's a lovely asparagus frittata recipe on the recipe thread.