When do you go Dean? I'm looking after about a qtr of an acre in S.Manchester for a community growing project We'll sort you out with some bits before you leave if you like!?
If I was you I'd grow loads of salad stuffs as they're pricey, but then I'm tight
You could go for a courgette plant, that green container that had my tiles in for a bit would be big enough, you just need to feed them LOTS. Some of the F1 hybrids are little plants rather than the big sprawlers so would be more suited - try 'Early Gem' or I've some seeds you can nab a couple of that shouldn't want to grow too massive.
Then loads of lettuce that you can pick the outer leaves on over a period of weeks rather than cutting the whole plant. 'Freckles' and 'rosemoor' are good for this as the don't heart up that quick. Rocket and spinach are super easy as well and will just keep on producing for you.
Toms are tricky outside round here... not enough sunshine!
It's dead easy honest, if you can manage electrics when they make my head spin around then you can def do this