[yrgulation]

All countries in the eu are obliged to eventually adopt the euro. But there is no set timeframe. Also all eu countries have central banks, euro or not. So the uk can promise it will join and never do and that will be fine. There is no “ordaining” here, its what the club wants. Like it join it no enjoy tue misery.

[fmajid]

Sweden does it by deliberately missing the convergence criteria. Denmark has an opt-out.