Nigel Farage will speak at UKIP's spring conference in Exeter today, saying that the public are angry with the failure of the three mainstream parties to deal with key issues.
The party is hoping to make a big breakthrough in local and European elections in May, and Farage will tell the party it is competing on a "bigger scale" than ever before.
Farage will list a range of areas - from Europe Union membership to cost of living and an obsession with renewable energy - where the public feels "incredibly let down".
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The beleaguered Labour Party leader is clinging onto power in the face of as many as 150 MPs voting to remove him from the top job today.
Mr Osborne said he is "not the person to provide the unity my party needs".