We should have stayed in UK currency union

Now prime minister, David Cameron of Britain wants a vote on leaving the EU. And to add more fuel to the fire, after last week’s election results,we have the Danes, a country very similar to ours, deciding they may follow the UK with a vote on membership.
A question recently mooted: If Greece leaves the euro, can the British offer the Irish people the opportunity to come back into the sterling zone? Its an interesting question; after all we had currency union for around 60 years.