Picture posting is enabled for all :)
I've got a peach tree fan-trained on a 2m tall SW-facing fence and it's warm but it's obvious there isn't as much warmth as you get from a wall - however it's OK because I have a clear cover on it until May that more than compensates - and also stops leafcurl dead in its tracks (it's a quarter ellipse of curved perspex so it looks good but it needs replacing soon because it's crazing and cracking - perspex can't stand more than a few years of UV - solid 1-2mm polycarbonate would be a better investment*). my mates call my peach tree shelter the bus shelter they always ribe me about it however they all want some peaches in july he who laughes last and all thatI've got espalier apples on a NE fence and they only produce on the branches that are above the level of the fence - but it's OK because the fence is only 1.2m so I'm not losing much.I'd say aspect and height are more important than the fence/wall difference - but I might have a different opinion if I was in the frozen North.If you are further north your South-ish fence would probably be OK for Tayberries or hardy self-fertile Kiwi "Issai" (simpler to grow and tastes better than an ordinary kiwi and even more important there's no other way of getting hold of the fruit).Cheers.*May-November it's working as a cold frame elsewhere.