Poland is proposing that the time that a Euro-aspiring country should spend in the exchange rate stability test of the Maastricht criteria be shortened i.e. that it not be as long as two years in the ERM-2 before becoming eligible for the euro.  Note that had such a relaxation been in effect from the start, the UK might already be in the Eurozone, since Black Wednesday hit during the ERM-2 phase of sterling, when the UK already was very close to the 2 year requirement.  Of course pre-Euro is different from post-Euro but one does wonder what the EU would look like with the UK as an ERM and then Eurozone country in the original group.