“Principle agreement has been reached. According to the information I have, the EU countries, representing 55 percent of the members of society, may block or demand changes to legislation,” the source told RIA Novosti.
In order for the United Kingdom to remain in the bloc, Cameron wants Brussels to allow his country to stay out of the EU movement toward an "ever closer union," make an explicit statement that the euro is not the official currency of the union, permit national parliaments to block EU legislation and, finally, give member states more independence in defining their migration policy.
Cameron’s office said much has been done but more hard work is still required, including on economic governance and abuse of free movement. The next key meeting in Cameron’s renegotiation process will be held in Brussels on February 18.