The EU is divided between member states that have adopted the euro and those that have not. This article looks at the issue of differentiated integration with particular reference to eurozone integration and the euro-outsiders. I explore the recent public debate in the UK on euro-outsiderness, comparing this with debates in Denmark. The article highlights some striking differences between the UK and Denmark when it comes to the actual management of euro-outsiderness in Brussels as well as some of the dilemmas facing euro-outsiders such as the UK, Denmark, Sweden and Poland as the EU struggles to exit its crises. Finally, I discuss the future of two-speed European integration and the UK's possible exit from the EU. The UK cannot escape the dilemma of favouring either influence or autonomy; whether the UK remains in or leaves the EU, it will need to allow the eurozone to proceed in order to prevent further eurozone crises.