well, the weather here isnt ideal, so you'd want somthing that can grow in the cooler damper atmosphere. if next summer is like this one, you might be ok.

i guess somthing like Hollands Hope would be worth a try.

dutch passion have a selection of outdoor strains, and are available to buy direct, or through most of the major UK based seed suppliers

heres a linkhttp://www.dutch-passion.nl/home.php?p=exterior&l=en
theres a link on the left of the page showing official UK suppliers, my mate has used Rhino seeds, they arrived quickly.