IIRC adopting the Euro (and changing the currency oc a country in general) costs a huge amount of money. Additionally the brits probably out a lot of pride in their currency, so the leap from “we’re so great we don’t need the EU and even are better off ourselves” to “we not only need the EU but the Euro as well” is even farther as just adopting a new currency or just reentering.
IIRC adopting the Euro (and changing the currency oc a country in general) costs a huge amount of money. Additionally the brits probably out a lot of pride in their currency, so the leap from “we’re so great we don’t need the EU and even are better off ourselves” to “we not only need the EU but the Euro as well” is even farther as just adopting a new currency or just reentering.
If small Eastern European nations can shoulder the cost of adopting the Euro, mighty Britannia should be able to do it, too.