Graham,
Apple like most fruitwoods is a beautiful wood to turn. But you've
got to turn it green and then boil it for an hour or two to stabilize
the severe movement in the wood. Once stabilized and finished turned,
fruitwood bowls are really beautiful with the contrasting heartwood
and sapwood. If younjust seal the ends with Anchorseal and wait for
the blanks to dry like I did once, you will have a whole bunch of
presplit firewood and kindling to use or give away.
good luck
Roger Dunn