Posted: 09/03/2015 at 09:43
Don't forget Blackmoor, I've had some great trees from them.
I recently did a small orchard area near our stables, I got their special 3 pack of apples, with 1 cooker and 2 eaters, as well as a plum and pear. I already have 2 victoria so went for a mrjorie's seedling as i'd heard it recommended on gardeners Q time, Similarly i went for a beurre hardy based on the same recommendation. I already had a concorde so that will pollinate it.
That's one of the main things to consider is if they are self fertile or not, as that makes a difference, for apples though you can generally stick a crab apple in as that'll pollinate most others.
Mines on a slope too, so i made sure i put shorter trees at the top of the slope, and the less dwarfing ones at the bottom of the slope. I did this due to the sun direction so i didn';t have the tall ones at the top shading the smaller trees at the bottom. But that might not be appropriate for you.