Have you considered growning cordons as opposed to espalliers both very nice but if you want more for the same space I'd go with cordons, you can also get duel fruit trees maybe worth considering, looks great BTW
I was looking at them in the Nursery at the weekend. Ruled them out as I have a lot of width to play with so would rather go long and low. Good suggestion for smaller gardens though.
Have you considered growning cordons as opposed to espalliers both very nice but if you want more for the same space I'd go with cordons, you can also get duel fruit trees maybe worth considering, looks great BTW