Hi David,
45 degree cordons are probably easiest, and you can still fully cover the sunniest 2-3m of wall.
These trees were all maiden cordons as Chris suggests, growing on a roughly SE facing wall, and from left to right there's a cherry, pear, 3 apples and a redcurrant.
The only one I wouldn't recommend as a cordon is the cherry, it needs the most pruning to keep it in shape and never crops particularly well.
With the apples, since they grow close together, I'd look for varieties with good scab resistance. There's also scope to choose a mix of dessert apples and cookers, and a spread of early and late varieties.
G&R