Although we only have a small garden we are also considering growing our own food this spring and summer in patio containers adn raised beds ie new potatoes, tomatoes, strawberries, salads, any other vegetables
In my experience, the best "dividends" (i.e ratio of product to effort involved and cost/flavour vs. supermarkets) are to be had from tomatoes in growbags and runner beans. Raspberries are good too. Grew pumpkins last year too, but they took over the entire garden!
Re the TTD food, did you see the Jay Raynor (sp?) programme on Ch4 about the difference between basics and TTD stuff. What he neglected to mention is that there's often a middle choice of just "own brand". In the old days "BK" (Before Kids), when I also had a higher disposable income, not being crippled by school fees, we also used to eat a lot of ready meals, now I work on an average of ?1 per person for the main meal ingredient!