Dear Herman, dear José...

Spanish Prime Minister Mariano Rajoy has appeared much more often than usual over the past few days. This morning, he was talking to the Spanish parliament about the €100bn eurozone bail..., perdón, "credit line" for the Spanish banks. Quite interestingly, he insisted on presenting the rescue package as some sort of victory for his government, and said,

"This is a loan that the banking sector will pay back on its own, and we have to celebrate the fact that our European partners have helped us."

You can read our take on Rajoy's attempts at spinning the bailout here. But the Spanish Prime Minister also revealed to the parliament that he has written a letter to European Commission President José Manuel Barroso and European Council President Herman Van Rompuy. The five-page letter is dated 6 June - i.e. three days before Spain officially sought financial assistance - and is available here.

The letter contains a couple of interesting points, including:

"It is essential that we, the European leaders, highlight our resolved and convincing commitment to the single currency. That is, we need to make clear that, in the medium term, the [monetary] union will strengthen its common institutional architecture. This undoubtedly means moving ahead with integration, or, if you prefer, a greater transfer of sovereignty, particularly in the fiscal and the banking domain."

"In the fiscal sphere, this mean creating a fiscal authority in Europe, which can steer fiscal policy in the eurozone, harmonise the fiscal policies of the member states and allow centralised control of [public] finances, in addition to acting as a European debt agency."

"In the banking sphere, it is necessary to rely on supervision at the communitarian level and a common deposit guarantee fund."

"We do not need to decide now how we will do it. It is sufficient to show commitment to this objective and start working to achieve it."

Well, if it is quite obvious for Spain to argue in favour of a single banking watchdog given the circumstances, the idea of a single fiscal authority in charge of supervising the national budgets of eurozone countries is actually a bold one - especially given Rajoy's previous unilateral decision to adjust this year's fiscal target without consulting eurozone leaders. Rajoy will discuss his plans with Merkel, Monti and Hollande in Rome next week, with a view to submitting them to all EU leaders the week after.

The central fiscal authority will likely be music to the German Chancellor's ears, although doubts remain over how many eurozone governments (and voters) would be ready for such a massive loss of sovereignty. On a slightly separate note, the Spanish Prime Minister should probably get a grip on reality and stop thinking that the simple promise to do something will be enough to calm the markets - the Spanish package has shown anything, its that a promise of action but without details or clarity creates more problems than it solves.