London: Prime Minister Boris Johnson has guaranteed that immigration levels will be cut should he win Thursday's general election, as Tony Abbott warns a Jeremy Corbyn victory would be a "disaster" that crushes the United Kingdom's economy.

Again pointing to Australia's immigration system as a guide for his own government, Johnson on Sunday offered an iron-clad guarantee to place new curbs on Britain's intake after it leaves the European Union.

British PM Boris Johnson has guaranteed immigration levels would be cut if the Conservatives win the election. Credit:Reuters Pool

The EU effectively allows citizens to have free movement to work and live in any member nations - an issue central to the 2016 Brexit referendum.

"I'm not hostile to immigration, I'm a believer in allowing people to come to this country if they have talents and what to make their lives in the UK and contribute to our country, fantastic, we are going to benefit from that," Johnson said in a fresh pitch to Brexit supporters during the final days of the election campaign.