OP I agree with the majority here, whilst exercise is great and will help you to lose weight initially , especially as you have gone from doing nothing to doing regular exercise, you will eventually plateau. For longevity , you should continue with the exercise, but also change your diet.
Jacket potatoes are fine, you could consider having a protein based filler such as cottage cheese or tuna, that would be better than cheese. Pasta, just be careful with the portion size, I adore pasta but I can eat loads and rack the calories up, so I only have it as a treat.
You could download an app like myfitnesspal and track your calories, it will help with portion size .