he British deal reached on Friday night in Brussels represents a feat of diplomacy if nothing else by the European Union.

 After 40 hours of negotiations, EU leaders finally reached a settlement that managed to offer concessions to Britain without changing the EU treaties.

 Whether the finer points of the agreement will determine the outcome of the referendum is unlikely. Britain’s referendum was always going to be shaped more by the domestic political landscape and internal workings of the Conservative Party than the nuances of the Brussels deal.

 While many in Brussels believe their work is done, a number of issues still remain to be worked out at EU level. The agreement struck at the summit must now be enacted. This means that changes involving secondary legislation – mostly covering the emergency brake for migrants’ benefits and new child benefit rules – need to be approved by the European Parliament.

 The question of whether the European Union would go back to the renegotiating table in the event of a leave vote will loom over the campaign, despite the European Commission insisting there is no Plan B.

 The absence of any mention of Article 50 – the article which outlines how countries can leave the European Union – has galvanised some Eurosceptics’ position that rejecting the referendum could allow Britain to renegotiate a better deal.

 Fundamentally, however, the agreement raises profound questions about the future, status, and viability of the European Union.