Cooking

Learn to use up leftovers and food that is about to go off - see Recipes for ideas
Learn to make sauces, much cheaper than buying pots of pre-made.
Cook in bulk and freeze portion sizes for when you get home from work too tired to cook.
Learn how to make cheap dishes – baked tatties, spag bolognaise, pasta sauce
Learn to make pizza bases. Pizzas are great for using up odd bits and bobs in the fridge.
Eat more vegetables than meat. Learn to cook veg dishes – stir fries are excellent. Bulk out meat dishes (ie. Spag bol) with 'hidden' veg.
Buy fruit and veg that is in season. Here is a list of what is in season throughout the year.
Build up a good store cupboard of things that suit your tastes in cooking. Good basics are: tins of tomatoes, garlic, pasta, beans, lentils, flour of all sorts, yeast, sugar, herbs, dried fruit etc.
Learn to cook cakes, flapjacks, biscuits etc to add to lunches. See recipes for ideas
Learn to cook for friends instead of going out. Suggest one friend brings starter, you cook main, another brings pudding.
If you are making two cups of tea, just use one bag!
Grow your own food. You don't need a large garden or lots of time and energy! See gardening section for ideas.