thanks for the quick reply, im using the official cable. my log looks something like this each time i attempt a flash
03/009/2013 13:09:57 - INFO - Selected Xperia SP (C5303) / 12.0.A.1.211 / Customized UK 1272-4687 R7A
03/009/2013 13:09:57 - INFO - Preparing files for flashing
03/010/2013...