My one best tip would be -- soup!
I bought a soupmaker for £20 and used it to make vegetable soup every morning. (It cooks it then blends it.) I used tinned tomatoes, onions, vegetable stock cubes, green veggies like cabbage, but also root veggies like butternut squash and carrots.
Of course you don't need to blend it, you can have it with chunks of veg if you prefer that.
To this I added cubes of ham, which is incredibly low in calories. You can buy it, or buy raw gammon or a ham joint, and boil it yourself (cheaper).
Using slightly different veg recipes and swapping the ham for cubes of chicken or turkey breast, poached without fat, and changing the herbs and spices, meant it was not the same soup all the time.
Drink a big pint mug of this soup 3 times a day and any other time you are hungry. Along with the soup drink a pint of hot or cold calorie free drink, like water, fruit tea or tea/coffee with milk or not.
If hungry in between meals, chew sugar-free gum and drink more water/fruit tea.
100% guaranteed weight loss. It's also extremely healthy.