We call these "community gardens" here in the Sates but same concepts apply... Actually a source of info for small gardens is at various websites that can be Google'd under "roof top gardens"... It's amazing how much produce can be grown in small spaces...

Others have recommended a shed and I would, too... With very little extra time or money you can collect rain water off it's roof... It is amazing just how much water can be collected from a small roof...

I also reccomend that you set up yer garden to grow in boxes... No, not cardboard but wood... Around these parts old railroad ties are cheap and readially available... There are alot of advantages to using them: 1. your soil will hold moisture alot longer meaning less water, 2. you will be able to manage yuor soil mixture better in a confined area and 3. this is a biggie, this will allow you to spend alot less time bent over...

As for your shed, if you situate it so that it has a window facing the afternoon/evening sun then it doubles as a green house for growing seedlings... And, of course, all your tools will be safe...

BTW, one thing that most gardeners don't think to do when growing produce is mulch... Yep, they mulch the heck outta trees and shrubs but don't apply the same logic to veggies... Mulch is very important for controlling weeds and holding moisture into the soil... We use straw for mulch and at the end of the season it get plowed back into the soil to provide humus and oragnic material for the next year...

Good luck with yer allotment and make it fun, too... BTW, it's okay to stop in at the "gardening 2010" thread...

B~