Another vote for figs in the north. I'm in North Yorkshire and my fig had two crops of lovely ripe figs last year. I think figs are also the best suited of the trees you mention to being grown on a patio, as they actively like their roots being contained. Brown Turkey is the nicest, IMO.
You might also want to think about support for container-grown fruit trees. Fruit like apples or pears that's grown on a very dwarfing rootstock is inherently unstable, and easily suffers from wind rock.
In the north of England you are still just about in bare root season, so you might be able to get some of this bare root. One of my local nurseries, which is very good, is https://rvroger.co.uk/. I'm picking up the last of my bare root order in a couple of days, but they're still lifting at the moment so might be taking orders. I know they deliver. I've also found Ashridge generally good for trees.
Which varieties had you thought of? There are some lovely ones that are really suited to the north and IMO it's so worth getting things that you know will work in your climate. In general, morello (sour) cherries are great if you're worried about it being cold. I don't know the north west as well as the north east, but over on this side, good pear varieties include Hessle, Cuisse Madame, Beurre Hardy, and almost anything suited to Scotland works well here too (Green Pear of Yare). Obviously you'd need a pollination partner but they're just more hardy than the self-fertile ones. For apples in a frost pocket, maybe Worcester Pearmain or James Grieve?
It will be harder to find these as patio trees - patio trees tend to be the boring supermarket varieties - and I wonder if you'd consider growing something slightly larger, but tolerating the fact you'd eventually need to pot it into a truly huge container (60l or so)? An apple on an semi-dwarfing roostock won't be truly happy in a container, but patio trees are so likely to be short lived that I'm not sure you gain much by choosing the smaller rootstock.