Post
by MPH80 » Tue Jul 08, 2014 1:42 am
In theory - you can only extend a visitor visa in exceptional circumstances and this would qualify.
However, if a valid application was submitted, with a valid fee, the chances of it being processed in the timeline would be low.
BUT - in order to do that - you'd have to submit his passport, which would then require withdrawl of the application appropriately early enough to get the passport back in time for the return.
None of this is guaranteed to work in the right timelines.
So the short answer is - you can't, practically, do it.