A few others to try in pots are Lingonberry (Vaccinium vitis-idaea), Honey berry (Lonicera caerulea), Goji berry (Lycium barbarum.) Like Blueberries, you are best to get at least 2 plants so they can cross-fertilize (do this by hand if growing indoors.) All of them prefer an ericaceous compost to grow in and so are best watered with rainwater, especially if you live somewhere with "hard" tap water. They all come from more northern climes, so will grow outside in most places - Honey berry grows in Siberia, Lingon berry in Scandinavia and Goji berry in Mongolia!
I have 3 blueberry plants in pots of ericaceous compost. They cropped well last year (first year) and am waiting to see this year - plenty of leaf buds. I think I have to pot them on every 2 years, My garden is very windy but have shelterd them about 6 foot away from a fence and near a lilac on the other side.
For raspberries try Autumn ones - do not need framework - I planted 'Polka' last year and was picking fruit end of November.
Don't see why you shouldn't try growing blueberries in your part of the country. They do reasonably well in pots outdoors. I'm in Lancashire just over the border from Cumbria. If your garden is exposed try positioning the pots near to the house. Top Hat does well here, not sure what the other variety is which I have!
I'm in North Derbyshire. I grow mine in an old bath outside. I have 3 varieties - Augusta, Julia and another which i can't remember - which fruit at slightly different times so I get a pretty long season.
I planted the bath up by lining the bottom with bracken, then filling it with acid compost. You do need to keep the soil very damp - rainwater is best - otherwise the fruit will be small and and not very juicy. I also give them a feed with an Ericaceous liquid feed once a month. They don't need pruning.
As an aside, one job for this year is to put a living wall down the side of the bath
Oh yes, and what else you could grow in a pot in addition to what's already been suggest - apples. I grow James Grieve in one and it fruits very well
Hello, Goji berry is a good idea. We have some and I can say that this fruit shrub is very modest to take care. The seed kernel in pot or garden, they grow alone. You can look at this video about growing in pot. Best luck and greetings,ThaiGer