British Prime Minister David Cameron said on Sunday he would block any attempt to introduce an EU-wide financial transaction tax because he fears it will harm jobs and prosperity in Europe.
Cameron said countries such as France pushing for the introduction of such a levy were welcome to go ahead and introduce it within their own borders.
But implementing a tax in the European Union when countries in the rest of the world were not bound by it would have a negative affect on jobs and prosperity in Europe, he said.
"If the French themselves want to go ahead with a transactions tax in their own country then they should be free to do so," Cameron said in an interview with BBC TV.
"But the idea of a transactions tax put in place only in Europe that doesn't include other jurisdictions, what that would do is it would cost jobs, it would cost us tax revenue, it would be bad for the whole of Europe.
"We would see a whole lot of institutions and activities go to other jurisdictions, to other places.
"I don't think (that) is sensible and also I will block it," he said.
Britain fears that if a financial transaction tax is introduced across the 27-nation EU, then banks and financial institutions operating in London would leave and move to countries such as Switzerland or China to avoid it.
Such fears about the powers of the City of London financial district being curbed were behind Cameron's veto of a new EU-wide treaty change to tackle the eurozone crisis at a Brussels summit in December.
The move sparked questions about Britain's future in the bloc.
President Nicolas Sarkozy said Friday that France should not wait for other European countries to get on board with what has been dubbed a "Robin Hood tax" or "Tobin tax" that would help reduce budget deficits.
But a French financial association, Association Paris Europlace, spoke out on Sunday against France introducing such a tax unilaterally, saying it would hurt the country's economy unless it was implemented across the EU.