No PM has yet brought powers back from Brussels
But "Whitehall officials are urgently reviewing every aspect of Britain’s membership of the European Union to support David Cameron’s promises to bring back powers from Brussels." Good luck with that.
Still, it's good to know that someone in Whitehall is actually looking at 'every aspect' of Britain's membership. Perhaps they'll even discover it's unconstitutional and a bad deal for Britain.
"A voice at the table" is not going to protect the City of London from what the Prime Minister himself admits is "constant attack" from Brussels.