Not as part of an arrangement to stay. I'm sure it will be part of the terms to rejoin.
Probably on the same terms of the never never than Denmark, Poland, the Czech Republic, Hungary and Sweden have (and that Britain itself signed up to): "when the time is right". The Eurogroup has to do some reforming which, due to consensus being required, will be easier to do with a smaller group.
Biting the hand that feeds IT
