Prime Minister David Cameron said a eurozone banking union should not discriminate against those countries who do not use the single currency.
He told reporters at the EU summit in Brussels that changes within the eurozone affect Britain as they "affect the organisation that we are are part of".
Mr Cameron also reiterated that Britain will not become a eurozone member, adding, "Certainly not while I'm Prime Minister anyway".
More top news
The mother of an ex-girlfriend of Arnis Zalkalns has told ITV News her daughter is "in shock" over his connection to the Alice Gross case.
A pilot scheme involving major record companies will begin this Friday. It is expected 20% of videos will be subject to a ratings warning.
Ever seen anything more eccentric? Bizarre innovations unearthed by a historian spanning 100 years.