Well for a start the best time to move it would be Oct or Nov.
If you could do it then, then the thing to do would be to dig round it now
about 2 to 3 ft from the trunk, and to cut back half of the roots, and
replace the soil, so that when you move it in the autumn it will already
have some younger roots and the shock will be a lot less to the tree.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk