3. Frozen food shops (such as Farm Foods), and other stores, sell (cheap) frozen cooked chicken strips which can be quickly defrosted in a microwave oven. They're sold primarily for use as sandwich fillings, etc but they're great in a stir fry (e.g. with the curry sauce mentioned above).
4. Fish is usually expensive but canned pilchards in tomato sauce are really cheap. Here's my recipe for them:
http://www.theanswerbank.co.uk/ChatterBank/Que stion655723.html
5. Corned beef is cheap on the Tesco deli counter. A few slices, served with beans and chips (or a buttered jacket potato) can provide a filling meal. Otherwise use it to make a corned beef hash.
6. Baked beans seem to have gone up quite a lot in price lately. But Tesco now sell their 'value' baked beans with sausages for less than a similarly sized can of baked beans. Serve a can of sausages & beans on toast (from a 'value' loaf, of course) as a cheap meal.
Chris.