In a letter to the Independent Bill Cash said, “As for treaty change, under the European Union Act passed this year, where an EU treaty is brought forward and appears to apply only to the eurozone, then a referendum is explicitly excluded under Section 4 of that Act. The Government will attempt to use this to bypass a referendum.”

Moreover, he said “However, the advocacy by the Prime Minister and the Chancellor of a eurozone fiscal union would amount to a two–tier Europe. This proposes fundamental political, economic and constitutional change. This would be damaging to British national interests by reason of the block majority vote within the eurozone fiscal union (and with it, the likelihood of other member states voting with Germany), which would undermine the single market and the City of London. Quite apart from this, there would be a fundamental change in our relationship with the EU. This is why a referendum is required.”