I have a lot of WW/Supermarket own brand low-fat ready meals, but I always bulk them out with extra vegetables (or salad in summer) as they don't fill me up.
For example, the other night, I had Tesco light choices beef in black bean sauce with egg rice (the WW one is nicer) but I bought a bag of stir fry veg and had some of that to go with it. It was more than enough for me, and I can eat for England.
Other than that, I sometimes do stir-frys using Blue Dragon sauces which come in sachets, and straight-to-wok noodles. You can add whatever meat/veg you like to those.
Sometimes I make myself a 'roast' dinner, although more often than not, I'll subsitute the roast for a chop, or a turkey burger or something, but I always have boiled new potatoes, loads of veg, a yorkshire pudding and gravy (made with granules).
It's hard to know what recipe ideas to give because it depends what you like eating really, and whether you're much of a cook, but most things you eat already can be adapted to a low-fat plan, like spaghetti bolognese, chilli, curry - it's just about choosing the leanest cut of meat, not using oil to cook with, and using very low fat sauces (or make your own sauce from scatch).
I make chilli relatively often, and I've also got a mushroom risotto recipe which is lovely - and just stodgy enough to feel indulgent!