On Tue, 28 Jun 2016 07:33:40 -0700, whisky-dave wrote:

But leaving theb EU does not have the "return" option.

There's not really anything to stop the UK rejoining the EU at any
time although the poorer terms on offer might be enough to put us
off.

Except the possibility of one of the 27 vetoing us.

Would it require only one veto

Yes. Any country looking to join the EU needs only be vetoed by one
existing member, and they don't get to join.