Tuna in Spring Water (yes, it is dry but the drained weight is higher than that in brine or Sunflower oil and matches the drained weight of that in Olive Oil, only difference is that it's entirely free rather than using Syns for oil-versions)
Fat-free greek yoghurt (Ditch the Muller Lights, they are being isolated on SP food diaries, you can flavour your own yoghurts and not worry about what's in them)
Stevia
Dark Chocolate (good stuff in a block can be used for eating as is or for cooking)
Oats (especially Scott's Porage oats, coarse milled as they can be made into cakes, overnight oats, pancakes, you name it and it's a HEB if you use 35g. Also a heart-healthy fibre source)
Eggs (Cheap and lean protein!)
Vegetables (both fresh and frozen, you can get chopped spinach to sneak into things and make lovely sauces with it)
Lentils and other pulses (for adding healthy protein, fibre and texture to curries, tanginess, stews etc)
Mushrooms
Peanut butter
Nutella
Herbs and Spices (So important, note that whole spices keep for a year, ground ones last for 3 months before they begin to lose flavour)
Baked Beans
Stock Cubes of various flavours
Soy Sauce
Marmite
Oyster Sauce
Worcestershire Sauce
Mustard Powder (packs more of a punch than actual made-up mustard as you simply add water and don't have the dampening properties of sugar and vinegar plus it's Syn-Free)
Tomato Puree
Pudding Rice (make your own rice pudding for no Syns)
Extracts/Essences
Cous-cous, dried pasta, Rice, Bulgar Wheat, Pearl Barley and Orzo.
Quark
Options hot chocolate
Cocoa powder
Honey
Reduced Sugar Jam/Marmalade (great in the middle of an oat-cake!)