Brexit Party supporters Barry Clarkson (left) and Alastair Sutcliffe pose in matching Brexit Christmas jumpers prior to a party rally in Buckley, north Wales on Monday. Photo: AFP

After almost four years in which Brexit has dominated British politics, the word itself will be largely banned within government from next month, an official said Tuesday.

Parliament is expected to ratify Prime Minister Boris Johnson's plan to leave the European Union in the next two weeks, paving the way for Britain's departure from the bloc on January 31.

London must still thrash out the terms of its future trading relationship with Brussels but Johnson and his team are determined to move on to other things.

One official, speaking on condition of anonymity, said the word "Brexit" would be used as sparingly as possible."You won't hear the word cross my lips after January 31," the official said.