Former minister and leading Brexit campaigner Ian Duncan Smith has said the leave campaign can prevail in the EU referendum and denies the debate has descended into mud-slinging.

Mr Duncan Smith, alongside another minister Priti Patel, spent yesterday in Maidstone, helping campaigners leafleting homes in the first major Brexit event to take place in the county.

Scroll down for audio

He warned that a vote to stay in the EU risked more criminality and a risk of terrorism as migration was "completely out of control."

Asked if he thought voters were getting enough unbiased information about the pros and cons of the EU, he said:

"I'm not sure there is such a thing as neutral information - there is just a bunch of facts that are being presented one way or another."

The former minister's visit coincided with figures that revealed that net immigration to the UK increased again, reaching a new high of 330,000 in 2015.

Mr Duncan Smith said that a key question for voters was whether leaving the EU and regaining control of the UK's borders would help limit immigration.

"Do you think it is acceptable to have an open border with the EU and have an unlimited amount of EU citizens come over as migrants to the UK?" - Ian Duncan Smith

"In getting those powers back, should we not have control of our borders? Do you think it is acceptable to have an open border with the EU and have an unlimited amount of EU citizens come over as migrants to the UK? And there are issues around that about access to schools and hospitals and housing."

He added that to stay in the EU would mean British workers squeezed out of jobs.

"Migrants mostly come over to do low-skilled and low level jobs and therefore are competing massively with the British workforce, and have driven wages down in the low-skilled area."

He warned that a vote to stay was a risk because the Eurozone was "in complete crisis" and unemployment levels were "breathtaking" in some countries.

"On top of that, you have migration completely out of control within the EU because so many have come across the borders into the EU. There are issues surrounding that such as criminality and further problems with terrorism."

But both sides in the EU referendum campaign have been accused of peddling "misleading" figures and "implausible assumptions" by a committee of MPs.

The Treasury Select Committee calls Vote Leave's claim that Brexit would save £350m a week "deeply problematic".

And it says Remain's claims families would be worse off by £4,300 a year if Britain quit the EU were "mistaken" and had "probably confused" voters.

WATCH: Our guide to the key issues for Kent in the EU debate filmed in Strasbourg