George Brandis has again been forced to deny he is London-bound, dismissing claims he will leave the government mid-year as "a very, very old piece of gossip".

But some colleagues are still discussing the move and believe Senator Brandis is headed to Australia House, despite the Attorney-General's public denials.

Senator Brandis was first tipped to replace Alexander Downer as Australia's High Commissioner to Britain last year, amid a public conflict with former solicitor-general Justin Gleeson.

Speaking to Sky News from New York, Senator Brandis scoffed when asked about his plans.