France asked for a politic supervision of the independent central bank, which was refused

I do not know whether or not it was the British behind the refusal, but as unlikely as it might be in general that British concerns might be behind refusing something that the French wished to see happen (ahem)...

... it seems quite plausible that the British would object to setting up a formal political authority for the Eurozone ... it would be my first guess as to why "it was refused".

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.