Posted: 16/09/2013 at 23:50
I would agree that going for early cropping varieties of whichever fruit trees you decide on is a good idea as it will give them more time to ripen in the shady conditions. Most fruit trees can be trained to have a long trunk with a 'lollipop' or larger head simply by progressively pruning the lower branches off almost flush with the trunk while it is young. Remove a third of the leader each Winter just above a strong shoot which will turn into a new leader. Winter pruning will make pruned branches grow more strongly in the Spring. Once the tree has reached the maximum height you want, you can Summer prune the leader each year which will restrict its growth. Trees trained this way are sometimes called 'minarette' or 'columnar' fruit trees.
As it happens I have bought a few (normal type) trees from the company waterbutts mentioned and have been pleased - large, well-grown young trees which were very well packed for delivery. Whoever you decide to buy from, give them a ring, explain what you are trying to achieve and ask them which rootstock they would recommend for the variety you are after to achieve the height you want - any good supplier will be happy to help.