Re: O/S Transfer?
It all depends on how long you will be OS.
If short term then I would do as Kennas said Above, If it is a permenent move, then It may be worth selling up everything and setting up OS, this also helps with the non resident for tax issue, but it will trigger a taxable event so keep this in mind.
When I moved OS it was permenently, so I sold every thing and opened up new OS accounts, and started fresh, this was the best for me.
But it mat not be the best for you, so check with a good accounant / lawyer that is familiar with dealing with these maters, most are not.
All the best with the OS move.