Jumping on the back of this - my new house has 2 fifths of an acre approx of grass, on a slope, with a spring which has just been redirected into a council drain - with 5 foot fencing just installed.  It's mainly amenity for me and my dogs, but I'd like to make it work a little.  I'll put the usual rasps, blackcurrants etc round the fenceline, and some honeysuckle, clematis etc; but wondered how many fruit trees and what varieties i could add.  As I'm elderly, and fat, so not very fit, I can't do much of the work myself, so need space to get the grass mowed round trees 
Any thoughts?
Photo is an approximation based on the google maps download