Thankyou everyone for your replies and suggestions!

I did the groceries the other day and was more aware of the salt, fats and sugars in the stuff I brought. While I still got a little of the pre packaged stuff, I have tried to make it some of the 'healthier' stuff. Rice crackers (still too much salt, but I got the least offensive ones!), arrowroot bickies (too much sugar), yogurts (not quite 'too much' sugar but almost!). I got unsalted and no added sugar peanut butter, salt reduced tomato sauce, baked beans and tinned spaghetti. It all tastes strange to us and DH is the one complaining! Baked bean toasties are just not the same!!
It's kinda depressing realising what I have been feeding the kids. But you do the best you can with what you have. Now I have better info, I can do better. They do eat alot of fruit and DD is great with eating raw veggies, but DS1 will only eat raw carrot (literally it's one of two veggies he eats- raw carrot and fresh corn on the cob), and there is only so much raw carrot I can feed him! DS2 is a machine and will eat absolutely anything I throw at him, lol! Cheese and yoghurt is popular, though I try not to give them too much as they are a little sensitve to it and they all get sore tum's if they have too much too often.
DS1 will eat a great breaky, I have gotten some more porridge and vitabrits, adn that's him done. DD isn't so fond of breaky or cerials, so she usually has a sandwich of some sort, usually peanut butter with a little honey, which is ok, now I have the salt and sugar free PB. Dinners are ok for me I do have a good stash of recipes, I just have to dig them out and go through them to see what is suitable to cook with 3 kids underfoot(ie, quick easy and ok for a 4,3 and 1yr old to eat!).
So I am getting there. It's a bit of a shock for the kdis I think with me saying no to alot of what they want and limiting and really focusing on what they eat. I had kind of been just letting them eat whatever they asked for Now I am making sure they eat fruit and the healthy stuff before getting the junkier stuff, and making sure they aren't eating unhealthy cerials. Hopefully it will get easier and I will find my healthy groove again!!