Prime Minister David Cameron said today there are "opportunities" for the UK to seek changes in its relationship with the EU.
Following a summit of EU leaders in Brussels, Mr Cameron said:
We did not stand in the way of the eurozone having a banking union... now there are opportunities for us to seek changes in our [EU] relationship, changes that the British people will be more comfortable with.
They [the eurozone members] want to make changes, and we can ask for changes too.
Though none of the elements of the banking union agreed would directly affect the UK, Mr Cameron highlighted that any changes within the eurozone would ultimately affect the wider EU "of which we are an important part".