free spirit - are you down with the UK ditching sterling and signing up to the Euro?
no.
To me one of the main arguments for us staying in the EU is that we're specifically protected from the impacts of the stability and growth pact, and the Euro. There are no penalties that can be applied to us for breaching those nominal debt targets, and we can't be held to ransom by the ECB because we can print our own money if needed to prop up the banks / economy / whatever. So we can decide by ourselves to ditch austerity and there's fuck all the EU can do about it, the UK government is implementing austerity voluntarily not because the EU are forcing it to do it.
Basically what happened to Greece can't be forced on us by the EU, it's impossible with the current set up, so the comparisons with Greece that many people on the left have made are false comparisons.
We can stay and fight alongside with Greece, Spain and other countries if we* and they swing to the left without any fear of what happened to Greece happening to us. They have a far higher chances of ending up forming a minority bloc in the European Council with a blocking percentage of the EU population with us than without us because we are one of the 4 countries with the highest population levels.
Also in Europe at least the parliament is elected by PR, so it's far more likely to end up with Socialist / Green / Left blocs having a role in a left / progressive coalition than would have been the case in the UK - at least prior to Corbyn seemingly managing to retake the Labour party for the left. If the non labour left in the UK got it's act together electorally then it has a far higher chance of getting representation via European PR elections than it does via first past the post elections to the UK parliament.
* obviously all this would depend on Corbyn ending up in power in the UK rather than another neoliberal prick, but that's the best case scenario I can envisage, and it seems more likely than the left rising to power in the UK in the event of a vote to leave, with right wing tories and UKIP in the ascendancy.