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 operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.