It sounds as if a few of you are warming to the ideas used in permaculture
Forest gardens are a great resource but you don't have to go the whole hog and create a forest garden just take what you need from the principles of getting more than one use out of everything in your system and try to put all your waste back into the system in some way, make it as self sustaining as possible. You can practice permaculture in a small back garden using pots and planters if that's all you have to work with.
It's a huge subject but well worth dipping into, you'll soon see how productive it is. Check out Geoff Lawton on youtube, look for 'greening the dessert', I'm confident that you'll be impressed.
Rosemary, we have all manner of red white and blackcurrants and gooseberries in our FG as well as 3 varieties of gooseberry/b'currant hybrids, brambles, chokeberries, berberis, strawbs, rasps, a chocolate vine - not had the fruit from it yet but keen to try it - rhubarb, black elder, hazels, apples, pears, plums and cherries although we don't get much top fruit here most years. That's just the fruit! We keep a lookout for unusual perennial edibles too, we have tree onions and globe artichokes, all sorts of herbs and medicinal plants too. We need as much bee fodder as possible to extend the season for our girls and the many bumbles round here. We do a bit of guerrilla planting in the hedges, things like as honeysuckle and ivy. it's surprising how many edible flowers and weeds there are too once you start looking into it.