I missed this at the time.
I'd say blueberries are a bit of a waste of space, they take ages to produce a decent amount, the plants cost loads, they need special compost and the yields are low.
Whilst strawberries, you can buy 3 plants, the next year you have 30 and the year after 300. It won't be long before you have a freezer full from 2 summers ago.
I'd add thornless blackberries to the mix, thuggish but ho boy the taste and the volumes!
Then for trees, a few apples grown on espaliers or cordons and pruned regularly will produce a decent amount whilst pears ripen overnight and can be spoilt by birds and wasps, cherries the birds get the moment they are ripe and plums are horrendous for the moth grubs inside them.
Rhubarb, you can get a decent lot in a small space but it does take a couple of years to get going.
For veg, apart from the usual potatoes and tomatoes and onions, think how many meals or jars of stuff can I make with this space? So for example, peppers or chillis? In the same space with 3 plants you could get maybe 3-6 sweet peppers harvested if you are extremely lucky, or 30-60 chillis, which can be made into a sauce or relish or jam and keep you in chillis for a year.
Onions, you can plant relatively closely to each other, and take out the larger ones around this time of year to use and leave the others to carry on growing. My polytunnel ones are starting to bolt so I take those now and use and leave the rest to carry on.
Leeks are a good use of space over winter, but you can get leek moth so when they go in, often after the potatoes, cover with a fine mesh only removing for weeding purposes.
My other top tips for growing to eat is do not forget spinach. In the last year of living in the UK I put spinach plants in every nook and cranny in the autumn and I was harvesting carrier bags worth every weekend; it really helped to give winter food a burst of healthy goodness all winter long.
The best herbs to grow for cooking IMHO are thyme, coriander and basil. Thyme grown all year round anyway, basil and coriander you can grow a shed load of, cut it regularly and wash, dry off and pop in a freezer bag and freeze, and then when you need it, just crumble some into whatever you are making near the end of the cooking. Don't let either Basil or Coriander flower, just keep cutting and freezing.
And my last one, is cucumber. Grow loads, and make cucumber jam. Honestly, it is one of the best condiments I ever made.