Just 2 comments...
1. Why not post this on uk.rec.gardening?
2. You are going to need very heavy containers to stop them being blown
over in the wind, unless you intend to have them somewhere very sheltered.
Tree type cotoneasters,
White berried Mountain ash,
Flowering crab apple on dwarf root stock,
Various slow growing conifers
and many more, depends if your site is sheltered, close to the sea or what.
If you are near enough to the sea, I think one of the dwarf Mediterranean
fan palms would survive in a pot - especially if you could move it indoors
for an overnight if it threatened to get into the teens (fahrenheit - I
think that would be about minus 6 C. ) They are grown that way in places
like Seattle in the US, I know.
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