It was moved once before when it was very young and seemed to take about 3 years to recover properly; enough to start producing fruit again.
Will it survive? It won't involve a long journey.. maybe we could cut a big block of earth around the roots (are they likely to be huge?) and insert it immediately (half an hour later!) into a similarly sized hole in the new garden..
Do you think it will survive this? 9 year old DD loves her apple tree. My mum got it for her, for her 3rd birthday as all she wanted was an apple tree that year!