sorry, are you suggesting he'd want a retrial with a different jury, in the hope that they'd go the other way? Retrials are usually sought by the prosecution; you can see the possible grounds here
http://www.cps.gov.uk/legal/p_to_r/retrials/
Defendants just appeal, and that's usually on procedural grounds (the judge's summing-up was inaccurate, improper questions were allowed in cross-examination etc). But that doesn't normally get you a retrial unless the appeal court rules that there was something wrong with the conduct of the original trial. A jury verdict would have to be very perverse indeed for it to form the basis of an appeal.
This isn't my field so someone else may be able to give a better answer.