Ukip has launched its manifesto, telling voters it is time to get rid of the three main parties.

The new poster features the faces of Gordon Brown, David Cameron and Nick Clegg alongside the slogan "Sod The Lot".

Ukip leader Lord Pearson of Rannoch said it is time for a new politics and argues that leaving the EU would save up to £120 billion a year - with no jobs or trade lost from Britain.

It was a choice of public sector cuts from all major parties versus no cuts at all under Ukip, he said.

In its manifesto, Ukip promises an "end to uncontrolled mass immigration" through the introduction of an immediate five-year immigration freeze followed by a new stricter points-based system.

It reaffirms a plan to ban Muslim face coverings such as the burkha and pledges to "scrap political correctness in public affairs".

And it commits to setting up a Royal Commission to "allow scientists to reach a conclusion about the facts and economic implications of global warming", adding that the party is "sceptical" about man-made global warming claims.

Ukip is pledging a recall system for MPs and an element of proportional representation for national and local elections.

The manifesto sets out tax system reforms, raising the income tax threshold to £11,500 and introducing a flat tax rate of 31 per cent combining income tax and National Insurance.

The party proposes a large-scale public works programme to create one million new jobs through a defence equipment programme, new nuclear power stations, prisons, transport infrastructure, and flood and coastal defences.

Under Ukip, binding local and national referendums could be triggered by 5 per cent of the population on any issue. Ukip also pledged a recall system for MPs and an element of proportional representation for national and local elections.

After securing the election of 13 MEPs in the last European elections, Ukip is hoping to make a breakthrough with the election of its first MP in a Westminster election.

In particular, it is targeting the Buckingham constituency of Commons Speaker John Bercow, where the party's former leader Nigel Farage is standing.