Having read the "didn't know they grew in this country" thread - it
occurs to me to ask.

There's a wall at one side of my garden which has a young, sick ash
tree. Unless some miracle happens and it looks all healthy the rest of
the year I'm going to rung bark it late in the season - which will give
me a west facing wall, sheltered by next door's house 10ft behind, which
seems to me to be a nice place to put an espalier.

Suggestions?

I'm thinking of a Sturmer Pippin apple, as they are local

Andy