Until his appointment as UKIP chairman earlier this year, David Campbell Bannerman was probably better known for his links with the Conservative party.
A former Tory councillor, he has stood twice for the party at a general election and served as a special adviser to Sir Patrick Mayhew, former Northern Ireland Secretary.
DAVID CAMPBELL BANNERMAN
Job: Public relations
Family: Unmarried, no children
Experience: UKIP chairman, ex-Tory election candidate, ex chairman Bow Group
He has also been chairman of the Bow Group, an influential Eurosceptic think tank.
He joined UKIP in 2002 and fought the North Cornwall seat for the party at last year's general election, finishing fourth with 5.5% of the vote, an increase of 1.1% on the party's showing in 2001.
A PR man by profession, he was an early advocate of rail privatisation and is a former spokesman for the Association of Train Operating Companies.
He is an unpaid party chairman and continues to work in London as a communications director.
The unmarried 46-year-old, who describes his hobbies as writing film scripts, is a distant relative of former Liberal prime minister Sir Henry Campbell Bannerman.
He is keen to emphasise his strengths as a public speaker and media performer - and his grasp of modern marketing techniques.
One of his ideas is to rebrand UKIP with more emphasis on the word "independence" - stressing the party's belief in democracy and freedom from government interference.
Like Mr Farage and Mr Suchorzewski, he says he is determined to broaden UKIP's appeal beyond its narrow focus on withdrawal from the EU.
He recently argued it was time for a "major realignment" of British politics of the kind seen when Labour emerged as a parliamentary force 100 years ago - and clearly believes UKIP can be a part of this.
But his critics question whether he has the political experience to hold the party together.
And some have questioned his plan to work in tandem with Mr Farage, who he says would carry on as leader of UKIP's MEPs in Brussels.
He says the party will be getting "two leaders for the price of one" - but critics wonder if he would be able to keep Mr Farage on board after defeating him in a leadership contest.
Mr Campbell Bannerman says he wants UKIP to become a "serious, larger, UK-wide political party, which is professional, credible, broadly based and effective at every level of politics".
He also stresses he wants to the party to offer "a full and radical manifesto of policies".